'08 6.7 Runs ruff

I have a 08 6.7 auto runs ruff/vibration when running under power, let off the accelerator and the vibration goes away. 160k miles, smarty Jr, valves ran at 150k. If it were a gas motor I would check to see if hitting on all cyls.

Any thoughts? re-check valves? broken mount?

check your u-joints

We have a winner!! I was trying to find someone in the area that balance shafts-no one close. Had the tires balanced, but did not help. Could not get any movement out of shaft. Set brake, trany in neutral, got movement. Sometimes it takes someone from the outside, i was too close to it.

Thanks

Phil

Glad you found it.