2002 GMC C1500 Engine revs...

2002 GMC C1500

85,000 MILES • V8 • 2WD • AUTOMATIC

MOYBOY25

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I have a 2002 GMC Sierra 1500. The engine (especially in the morning) revs and comes back down, revs, and comes back down.. etc... while sitting in the driveway warming up. This afternoon, the "service engine soon" light came on...

Thoughts? I'm thinking alternator...

Oct 27, 2008 at 2:50 PM

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