I have an 03 that we've swapped over to an 06 ECM and engine harness. Long story short I sent my harness off to be modified it came back got the new injector harness in, pedal assembly everything wired in, Ive gone back and traced my wires everything seems to be in order of where it should be. The truck will crank but wont fire, I'm getting fuel to the pumps but no rail pressure to fire. Anyone have any suggestions on where I could have a mistake?