I have a 2008 with 6.4L powerstroke. 144,000 miles. I have driven since it was new. Never any motor problems, always kept up regular maint. I did buy a bullydog E3 programmer. NOT DPF delete, just a tow program. I had the program installed since about 75K. Back in december there was a notice sent from Ford about a re-flash to PCM. I took it in for the Re-Flash and returned the program to stock. Ever since the Re-flash, my bullydog is inoperable. Bullydog says the new calibration wiped out their ability to use that programmer. No problem but ever since then, i have been losing power (over 2300 rpm) and it is random. Just acts like it is almost in limp mode. I can pull over and cut off and restart and the condition goes away for a period then comes back the same. I am getting a P0088 code which says fuel system pressure too high, but after hooking up on a ford diagnostic tool, the pressures dont show too high? Has anyone experienced the same or have any suggestions

 

You should move this to the 6.4 forum, its more likely you'll get a response there.

 

Moved to the 6.4L Powerstroke Diesel forum.