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1998 Chevrolet Tahoe Question: rough idle

 

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Thomas J Baynon, 5.7L V8, Reston, VA, June 21, 2011, 08:59
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Example: Sitting at stop lite.Idle starts to run rough in drive position,but when gear is moved to either neutral or park, runs smooth.

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    June 21, 2011, 09:29
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     Master

    sounds like a plug or coil failure. you need a shop to verify and give you a bid.

    Roy

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    Thomas J Baynon, June 21, 2011, 09:35
     Rookie

    What do you mean by a coil failure?

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    mastertech6371, June 21, 2011, 09:58
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     Master

    ignition coil. there is one for each cylinder and it could be failing by not firing the spark plug.

    Roy

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