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Q: engine vibration on 2005 Chevrolet Trailblazer

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vibration at low rpm when at a stop. vibration increases when ac is on.
(2) Answers
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Motor mounts are common, but could be something as simple as cleaning the throttle body out. When its dirty, the vehicle idles a bit lower than normal, even worse when the A/C is on. This can exaggerate normal vibrations.
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