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Have your engine mounts checked.
 

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Engine mounts look good. I figured it out. After replacing the spark plugs, the vibration is gone and power is better. It was much vibration at all , just more than everywhere else in the rpm range.

From the looks of the old plugs, I don't think they were changed regularly. A fresh set of champions made a big difference.


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Glad you got it fixed, but an FYI... 2009 and newer 5.7L uses NGK spark plugs from the factory, not Champions like with 2008 and earlier 5.7L. NGK # LZFR5C-11G
 
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