I have a 550 cat serial no.# 5ek-30002 and @1500 rpm's and above on acceleration the engine feels rough could this be caused by a damper gone bad any input would be very welcome.
With the engine Idling take a length of heater hose and put it close to the dampener and the other end listen if it rattles it is junk, if it wobbles it is junk. The true test is to remove it and on the tire bounce it about 3 inches if it rattles it is junk.
For a rough running engine, test the CAC, a cylinder cut out test, a top end set, fuel filter change, fuel pressure test, and inspection of the return fuel for air. That should cover it.