vcode
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- Joined
- Feb 15, 2015
- Posts
- 394
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- 268
Re your original problem, this is a common thing. I think GM wants them to do some elaborate test for engine mounts. Mine has a slight vibration at idle, but it only idles at 500 rpm. That is awfully low. Bring it up to 600/650 rpm and the vibration goes away. I think a tune can adjust that.....