I bought a 2005 f-350 earlier this summer. It has 85k miles on it. A month or so ago i took it the the local Ford dealer to have it serviced and the fuel filters changed. I went and picked it up and the truck had no power at all. It would surge like it had air trapped in the system. It was a Saturday morning when i picked it up and the service dept was closed, so i just drove it home. The surging and power loss gradually got better over the 30 mile drive. The next day same deal, push on the pedal and watch the rpms bounce up and down. It seems to get better the longer you drive the truck. I am new to the diesel world, however i do know the long history on this truck. It has had 6 injectors replaced as well as a cracked head at 56000 miles. It has been to ford for numerous problems with starting and fuel economy. Does the surging sound like trapped air still in the system or could there be another problem to look for.