Mechanics

ENGINE IDLES ROUGH

2003 GMC Yukon • 170,000 miles

The 5.3 engine in my 2003 GMC Yukon, idles very rough with the rpm's loping between 400-1000. Seems to be worse when damp or wet outside. Idles so rough at times, the engine dies. No codes, no check engine light, no warnings. Any ideas?
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Bugs7232
September 19, 2012.



Try cleaning the throttle plate on both sides with choke cleaner and see if that helps, it may be gummed up. Make sure to hook up air ductingwhen done.

Hmac300
Sep 19, 2012.