I posted this question a few days ago without any response probably due the title.
My brother is having a issue with his 99 F350 diesel automatic tranny pu. When in manual 1rst gear the engine stumbles and runs like crap. In drive or 2nd gear it runs fine. He's getting a code for a bad cam sensor. A new OEM and aftermarket sensor has been tried with no help to the engine problem. Does anyone here have any idea what might be going on? Maybe a bad ECM.


Thanks, Glen

 

Does he still get the code with the new cam sensor? That would point to a wiring problem, not a bad ECM.

 

Yes, still getting the code with the new cam sensors. But why would that make the engine run rough when locked in first gear and not first when in drive?