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Q:

rough idle on 1998 Chevrolet Tahoe

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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.
(1) Answer
(2) Comments
ignition coil. there is one for each cylinder and it could be failing by not firing the spark plug.

Roy