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I am experiencing vibrations which almost feels like a misfire on my 2010 Escalade. I see the RPM gauge fluctuates by 100-200 rpm's. But it generates no codes. 72k miles on the truck. Had lifter stuck last month, got the whole upper block rebuild. Replaced spark plugs but issue still present. Any ideas

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Could it POSSIBLY be the U Joints?  I had an odd vibration that I couldn't figure out for the life of me, took it to the mechanic who I trust completely and it turns out both the rear and front U Joints were original to the Escalade with over 200k on it.  Replaced them and the vibration was gone. 


Good luck with your issue.

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