2003 GMC Yukon rough idle at start up.

2003 GMC YUKON
81,000 MILES • V8 • FWD • AUTOMATIC
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MGOLMES
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  • 1 POST
When I first start the suv whether cold or warmed up the rpms jump form 300 to 500 for a few minutes. once the engine is warn no problems. Only when I shut off and restart.
Sep 5, 2009 at 8:57 AM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Has the check engine light come on? It sounds like a problem with either the EGR or throttle position sensor; however, without a check engine light, that is a guess. Also, check for vacuum leaks.

Let me know what you find.
Oct 5, 2009 at 11:19 AM
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