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1991 GMC SIERRA
360,000 MILES • V8 • 2WD • AUTOMATIC
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CHRISGUY
  • MEMBER
  • 1 POST
my GMC 1991 truck i have to rave it up to 3&4 thouands RPMs be for it goes in to revers
Jan 27, 2011 at 7:17 PM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
If your saying it won't idle, check that first. Clean throttle-body, also IAC/idle air control. How long since a tune-up? Any applicable mil codes, you can check those codes yourself.
Mar 7, 2011 at 1:47 PM
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