low engine idle?

2001 DODGE DURANGO
98,000 MILES • V8 • 4WD • AUTOMATIC
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FIXITALL
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  • 1 POST
when I start my car (engine is cool) the idle runs high, once I press on the gas it seams to idle down but every now and again it will idle back up, for instance to and from the grocery. only noticable when stopped at a light or first starting. It will occasionally rev up and down on its own at a stop light. dealer cant find anything wrong????
Mar 29, 2009 at 7:35 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
It sound sliek the throttle bore is dirty and needs service here is a guide to help you fix the problem also lets check for vacuum leaks.

https://www.2carpros.com/articles/idle-air-control-valve-service

and

https://www.2carpros.com/articles/throttle-actuator-service

and

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run down these guides and report back.
Mar 30, 2009 at 3:03 AM
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JUDY007
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I found a missing vacuum hose once I replaced it the engine runs great !
Oct 5, 2020 at 10:47 AM
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