rough idle on 1998 Chevrolet Tahoe

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.

by in Reston, VA on June 21, 2011
1 answer 2 comments
ANSWER by on June 21, 2011
sounds like a plug or coil failure. you need a shop to verify and give you a bid. Roy
COMMENT by on June 21, 2011
What do you mean by a coil failure?
COMMENT by on June 21, 2011
ignition coil. there is one for each cylinder and it could be failing by not firing the spark plug. Roy
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