Bought the 06 F250 about 5 months ago with 108k miles. Dealer said that the reason it was traded in was because of needing an EGR Cooler or Valve and an FIMC and that he had them replaced. The truck now has a k&n intake, mbrp 4in tbe, and a livewire with innovative extreme street tune that I've been running. Changed the Oil, and Fuel Filters around 110k miles and this problem started a couple hundred miles after the custom tune.

The truck has been blowing white smoke at idle and when I pull out from a stop but then the smoke stops once I get rolling. At WOT it seems to be misfiring and jerking. Not sure if that's correct terminology as this is my first diesel. But the oil temp usually stays around 6-13 degrees higher than the coolant temp so I thought about narrowing out the oil cooler. The degas doesn't seem to be "puking" coolant but there is just a little excess but nothing I thought was to much. The truck still has bolts but other than this what was done with the previous owner exceeds my knowledge.

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I think I've narrowed it down to the egr cooler because I pulled off the egr valve and saw condensation in the intake

 

Just fyi, with that tune ur stock bolts probably wont last long. mine ddnt!

 

Yeah you might want to think about deleting the EGR and getting studs if you're are going to be running those tunes.