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Engine runs rough when cold.

Tiny
THEODORE WILLIAMS
  • MEMBER
  • 2000 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
My 2000 Yukon XL with 5.3 runs rough when first starting in morning. Clears up when warm. I've had new plugs, wires, and injection service. It has 150,000 miles on it. I purchased it new.
Monday, January 10th, 2011 AT 4:09 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If you have electronic throttle control, note the bulletin below. Also, check if the problem clears when it goes into closed loop. A coolant temp sensor can also cause issues?
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Monday, January 10th, 2011 AT 4:54 PM

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