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I have a 2005 td42t which will not rev much past 2500 revs under load
and in neutral shudders badly at 3000 revs while blowing smoke it finally clears and revs through.
not 100% sure but maybe a start, make sure your air filter is clean and also check to see if your injectors arn't blocked. could also maybe an error with the on board computer not telling what the truck should be doing properly.