2002 GMC Envoy envoy rmp up and dawn

2002 GMC ENVOY
125,000 MILES
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ING_ENRIQUE16
  • MEMBER
  • 1 POST
when start the envoy for first time in the day the envoy almost die and rmp up almost 2000
and dawn up to 800 for 1 minute and stabilize and run without problem, the engine light is on
i changed the intake manifold gasket
Jul 22, 2013 at 7:11 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
It sounds like either a vacuum leak or an issue with the idle air control valve (IAC). The IAC is responsible for maintaining the vehicle idle. If the check engine light is on, you should have the computer scanned to identify what trouble codes are present in the system. Most parts stores will do it for free and most parts stores will do it for free.
Jul 22, 2013 at 8:34 PM
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