I have an 01 f350 7.3 with about 330000 miles on it with a rough idle only on acceleration. The issue began after hard to start cold/hot problem was fixed. It has a vibration to it on acceleration so at first I thought it was a tire or suspension problem but the vibration stops when you let off of the gas. Things I’ve done so far to it is replaced gpr, glow plugs, valve cover gaskets, icp sensor, cps (grey), ebp sensor and tube which was plugged up, new batteries and new positive cables, and had a low turbo boost pressure code removed which did not come back. I’ve been told by the dealership that it has passed the injector buzz test and they can’t find anything wrong with it. It’s now showing on contribution test injector 3 & 8 codes. Any suggestions will help thanks : >

Welcome to FTE.

Any codes? Do you have Forscan or Torque Pro? All OEM sensors, GPR, GP’s all Test with in specs?

It gives me 3 codes and one is for idm but it’s brand new so I disconnected it made sure connectors were clean (with battery disconnected) checked the wires and no damage. The gpr is new and with key off the two small post shoe .94 v. But the main reads right with the battery v.
p0269
p0284
i think it may be a fuel pressure issue? That’s my next step I guess