idle rough
355

Asked by csz4296 Nov 15, 2012 at 07:40 PM about the 1998 GMC Sierra 2500 2 Dr K2500 SLE 4WD Extended Cab LB HD

Question type: Maintenance & Repair

my truck is idling really rough it dosent seem bad when im driving but when i come to a stop it shakes really bad , or when i first start it  , what can it be ??

3 Answers
69,085

John answered 11 years ago

Is the check engine light on after you start it? Vacuum leak, worn spark plug(s), bad idle air control and many other possibilities. Start by checking the manifold vacuum.

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