Thread: Running Rough (cold / idle)

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  1. #1 Running Rough (cold / idle) 
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    Need a little help on where to start with my rough running 2005 grand prix N/A. It just began running rough when cold and at idle when hot. It still runs strong and no problems when moving from what I can tell.

    It has 163,000 miles on it. I changed out the plugs and wires at 110,000. Did the LIM around 125,000 with a nice throttle body clean.

    Any guidance on where to start would help! Thanks.
    2005 Pontiac Grand Prix, Base, 3800, N/A
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  2. #2 Re: Running Rough (cold / idle) 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Depending on the plugs you bought, they might need to be replaced again.

    Try cleaning your MAF sensor and throttle body aswell.

    SMGPFC Member #1
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