2500 DIESEL 4X4

2012 Dodge Ram

The engine in my truck runs smooth but when I am on the highway and accelerate I can feel a very noticeable engine vibration. If I take my foot off of the accelerator the engine smooths out, but the minute I push the accelerator peddal the engine picks up the vibration again.

Possible causes?

P.S. Had the engine scanned no trouble codes and passes all other computer tests.
January 3, 2007.

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