2002 GMC C1500 Engine revs...

2002 GMC C1500
85,000 MILES • V8 • 2WD • AUTOMATIC
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MOYBOY25
  • MEMBER
  • 1 POST
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 7:50 AM
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DENNYP
  • ✓Experienced Mechanic
  • 1,824 POSTS
Have it scanned for trouble codes. You might have a leaking intake manifold gasket.
Oct 28, 2008 at 4:25 AM
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