Just finished the test drive from replacing the fuel injectors in my 92' D150, 5.2MPFI, and the miss it had before is still there. I am at a total loss. After driving for about two miles and cruising around 55 it starts to miss, but only intermitently. A shop I regularly use had it for over a week and said everything they tested was fine. We discussed one possibility being the injectors as the may test fine electrically but may not be spraying correctly. I did a couple of more tests myself to determine if it was a fuel delivery problem and everything checked fine to the fuel rail. I replaced the injectors and the problem is still there.

 

check the fuel pump

 

Checked the fuel pressure while parked and actually while being driven down the road. I watched the gauge while the miss was happening and the pressure was fine.