Thread: Car stumbles after startup and has a jumpy idle

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  1. #1 Car stumbles after startup and has a jumpy idle 
    SE Level Member Lionel's Avatar
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    After I start my 04 GT I need to give it a shot of gas so it wont stall, i replaced the fuel pump and it didnt dp anything, I haven't replaced the fuel filter yet, could this be causing it? I'm leaning towards the fuel injectors. anyone have this problem?
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  2. #2 Re: Car stumbles after startup and has a jumpy idle 
    GTP Level Member SuperSport's Avatar
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    Remove and clean your throttle body with throttle body cleaner and a toothbrush. That will fix your problem.
    2001 Grand Prix GT Coupe
    Comp G Wheels - SS Corners - Infinity Sound - Tint - Digital DIC Swap - 893 Fogs

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  3. #3 Re: Car stumbles after startup and has a jumpy idle 
    SE Level Member Lionel's Avatar
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    is the throttle body what's connected to the air intake? just before it hits the engine?
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  4. #4 Re: Car stumbles after startup and has a jumpy idle 
    SE Level Member Lionel's Avatar
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    I have the throttle body in front of me, and all i see is a trap door looking thing, clean on one side and full of carbon on the other, am i supposed to remove the plastic cover on the side and clean up all in there?
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  5. #5 Re: Car stumbles after startup and has a jumpy idle 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    Check your MAF sensor or clean it. You can unplug it to see if it changes anything in the idle. If you don't notice anything change, there's a good possibility it may need replaced or cleaned. If it does change the idle after it is unplugged, thats not it, check for vac leaks.
    2001 GTP PT61 Turbo, E85, Stock Motor
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  6. #6 Re: Car stumbles after startup and has a jumpy idle 
    Donating Users Liquifire's Avatar
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    problem solved?
    98 GTP Coupe- 180* T-stat, GMPP Front Sway Bar, Dual Aeroforce Interceptor's, TDC FWI, TDC Taylor 10.4's, ZZP SS Plog, ZZP 3" SS catted DP, ZZP MPS W/3.4, AL104's gapped @.055, 3800Perf. PCM
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  7. #7 Re: Car stumbles after startup and has a jumpy idle 
    SE Level Member Lionel's Avatar
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    I changed the oil, flushed the coolant, put in a new fuel filter, cleaned out my throttle body, and yes problem is solved, So it was either the fuel filter or the TB being full of carbon.
    Appreciate the info guys, I'd have never thought to clean out my TB. Kinda new at the whole self repair thing
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  8. #8 Re: Car stumbles after startup and has a jumpy idle 
    Donating Users Liquifire's Avatar
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    that is what this site is for..........glad it is fixed.
    98 GTP Coupe- 180* T-stat, GMPP Front Sway Bar, Dual Aeroforce Interceptor's, TDC FWI, TDC Taylor 10.4's, ZZP SS Plog, ZZP 3" SS catted DP, ZZP MPS W/3.4, AL104's gapped @.055, 3800Perf. PCM
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