Question about 2006 GMC Envoy
If it only happens in cold weather, check your intake manifold bolts for tightness. #5 & #6 by the firewall are easiest to check. Some people will find these not even hand tight = rough running car.
However, if (when cold) your car is vibrating at idle IN GEAR and stopped, this would be a motor mount on Envoys and Trailblazer, very common.
Fan shouldn't turn by itself, you may have a bad fan clutch.
Posted on Mar 14, 2011
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Posted on Jan 02, 2017
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