Thread: Stumbling on Acceleration

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  1. #1 Stumbling on Acceleration 
    dhoeschen
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    Unhappy 11-16-2010
    I had this problem pop up a few weeks ago but today it's very worse...

    Under light acceleration around 4,500 RPM or so the engine would lose power and make a stumbling sound. Today it was happening at any increase of throttle that would kick in some boost. While it was making the stumbling farting sound I noticed that the boost gauge would peg.

    Before I thought this was a bad O2 sensor or maybe a need to replace the fuel filter but now it seems like something to do with the supercharger? I do have a constant SES - P0440 for my evac system that I have not fixed yet. Could they be related? Something else???

    Mods:
    COMP Cams Xtreme Energy camshaft: 76-801-9
    COMP Cams valve springs 26918-12 and retainers: 774-12
    SLP Performance Supercharger Pulley, 3.50 diameter: 100227A
    e3 Spark Plugs: E3-62
    Summit DIS coils: 850017
    MSD Super Conductor Wire: 32789
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  2. #2 Re: Stumbling on Acceleration 
    jcurrieta
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    Default 11-16-2010
    well i have the same problem,,, but no ses light on??

    UPDATE!! ----I fixed my issue,,, it was a short,,, previous owner replaced the plugs and wires,,, and a few weeks that's when I bought it,,, then later on the metal on the o2 sensor got hot was shorting out on the rear drivers side plug wire, as they were touching. So I fixed the plug wire and tied them back from each other. thanks for all the help anyhow.
    Last edited by jcurrieta; 01-14-2011 at 03:03 PM.
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  3. #3 Re: Stumbling on Acceleration 
    bstuby
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    Default 11-16-2010
    check your plugs, wires and coil packs. might have a crack in one of plugs. I have had a ses light on for the evap for alomost 5 months now and really have had no prob with it but i just replaced it today 24 bucks and still cant tell the difference
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  4. #4 Re: Stumbling on Acceleration 
    blueguy
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    Default 11-16-2010
    No breathing mods...with a cam and smaller pulley...GENIUS!

    Like stated...pull the plugs and hope one isn't bent.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  5. #5 Re: Stumbling on Acceleration 
    dhoeschen
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    Default 11-16-2010
    Thanks for the replies, I'm going to replace the fuel filter and check the plugs.

    ...and thanks for the criticism... Next time I'm looking for advice I'll think twice about posting here without advertising EVERY mod instead on only the ones that may seem relevant.
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  6. #6 Re: Stumbling on Acceleration 
    matt5112
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    Default 11-16-2010
    exhaust leaks are common with headers on these cars and can easily cause misfires and stumbling.

    I'd try a higher quality plug... E3's if you look at them show signs of poor casting quality.

    Try autolite 104's.
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  7. #7 Re: Stumbling on Acceleration 
    bstuby
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    Default 11-16-2010
    o damn... i didnt even read his mods. could be a prob
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  8. #8 Re: Stumbling on Acceleration 
    blueguy
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    Default 11-16-2010
    Quote Originally Posted by dhoeschen View Post
    and thanks for the criticism... Next time I'm looking for advice I'll think twice about posting here without advertising EVERY mod instead on only the ones that may seem relevant.
    It's called contructive criticism...can't take it? It's the internet...sorry.

    You asked for help...I posted what I thought. If you don't like it...tough cookies jeeves. These cars are prone to popping pistons. Hence why I said CHECK YOUR PLUGS.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  9. #9 Re: Stumbling on Acceleration 
    alkygto
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    Default 11-16-2010
    ^Unfortunately for you OP, Blue is correct. And he was being nice about it.

    I had similar mods (no cam though) and a weak fuel pump and killed #6 piston.

    I also did'nt see any mention of a tune?

    1997 Pontiac Grand Prix GTP
    1969 Pontiac GTO
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  10. #10 Re: Stumbling on Acceleration 
    blueguy
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    Default 11-16-2010
    Quote Originally Posted by alkygto View Post
    I also did'nt see any mention of a tune?
    Also something I forgot to mention...I'd like to see how that car ran...
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  11. #11 Re: Stumbling on Acceleration 
    dhoeschen
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    Default 11-17-2010
    Forum FAIL!

    Fuel filter, fuel cap! Runs GREAT, no SES. Goodbye...
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  12. #12 Re: Stumbling on Acceleration 
    jcurrieta
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    Default 11-17-2010
    cracked plugs,,, why have i never heard of this happening on any other car,,, how come so much with these cars.
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  13. #13 Re: Stumbling on Acceleration 
    matt5112
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    Default 11-17-2010
    Quote Originally Posted by dhoeschen View Post
    Forum FAIL!

    Fuel filter, fuel cap! Runs GREAT, no SES. Goodbye...
    Forum fail because you didn't do basic maintenance like fuel filter?

    Cracked plugs happens because people dont put them in properly...

    And over torque them.
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  14. #14 Re: Stumbling on Acceleration 
    dhoeschen
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    Default 10-27-2012
    Had another customer with the same issue. Cheap 'performance' coils made in China.
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