Thread: Chug at start, "bouncing" tach when key turned to "on"...

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  1. #21 Re: Chug at start, "bouncing" tach when key turned to "on"... 
    Donating Users zildjian102's Avatar
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    just found this thread. My tach does the same thing when i turn the key to the on position. it does that little bounce thing buy my car runs fine there is nothing wrong with it so idk
    2002 Grand Prix GT- top swap soon
    1997 Pontiac Grand Prix GTP-project/parts

    3.4 pulley, intense tune, SD headers, intake, 180 tstat, al104's
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  2. #22 Re: Chug at start, "bouncing" tach when key turned to "on"... 
    GT Level Member RyanL's Avatar
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    Quote Originally Posted by SlowNA06 View Post
    See what your EGR is doing at idle. This strikes me as a vacuum leak, though, so check all your connections.

    Also, try unplugging the MAF and seeing if it runs better.
    vac leak should have coded an o2 for lean mixture.
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