*just noticed I posted in wrong section, excuse my mistake* Whats up fella's I have a 00 Denail 178k on the clock I am the original owner. I have been at battle with the random misfire code (forget exact code and cyl) but its the same code everyone blows after a while. I have replaced the Cap, Coil, Rotor, Plugs, Wires and Fuel Filter and replaced a faulty O2 about 8k miles ago and the truck would still heavily misfire once you got a good load on it, sometimes so bad it would feel like the motor is going to break free from the mounts and drop out the bottom! lol So today I replaced the stock spider assembly with the Delphi MFI unit, replaced all the gaskets with a Fel-Pro Kit, reassembled fired the truck up and took it for a test drive and its still doing the same damn thing. I didnt unhook the battery so I did that thinking maybe it needs to reset and it got a little better but still misfires under mid/high load and when going into overdrive. With all of that being said, my fuel pump is louder than the 2 external inline Walbro 255hp's I have on my race car.... assuming I should replace the pump next? Does anyone know what the fuel pressure should be on the truck and do I check it running or with just the key on? If the pump doesnt fix it I am yanking the motor, swapping in a Cummins and going emissions exempt screw this :glasses: Thanks in advance.