Thread: 3.8 engine idling rough-vibrating

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  1. #1 Re: 3.8 engine idling rough-vibrating 
    GTP Level Member dmahlikGT's Avatar
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    Check engine light on? any codes? Could be just a needed tune up and bad mounts.
    04 GTP-3.6 pulley, custom tuned, Intake, headers,thrush exhaust, al104 plugs, 180* stat, shift kit, flipped mounts

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  2. #2 Re: 3.8 engine idling rough-vibrating 
    GrandPrix Junkie
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    I would say plugs/wires, replace the fuel and air filter, clean the MAF and check for vacuum leaks then see what you get.

    Just stick w/ stock plugs and wires. No need to get super duper quintillion platinum plugs. I personally run NGK V-Power TR55's and have yet to have and issue. Also stock Delco wires from the dealer.
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