Well, its not my truck thats acting funny but one of the work trucks is. Its a 94 PSD and it starts up fine and idles fine but when you give it some throttle it revs up to about 2000 and then flattens way out and starts smoking like crazy. It will slowly creep up towards 3000 but very very slowly. Its only got 130,xxx on it but it is only used in the winter when towing gets heavy.Thanks in advanceRichard

 

could be injector o-rings

 

Ok, was kinda hoping it would be something simple but thank you.