Took the '94 idi Turbo dually for a ride today. After extended driving, I got down to idle speed and had a rough idle. I gave it some fuel and it smoothed out. Sounds like time for an Injection Pump. No? I did pick up a trailer with a 18K capacity, the trailer only weighs about 4K. Then the wife drooled all over a 5 year old Kawazaki Mule side by side. That came home on top of the trailer and a few hills were a bit much for the truck. Another possible indicator of a failing pump. So the next project might be replacing the pump. Uh, How?