Have 2003 ram 1500 4.7 19600 miles. Was on way home on interstate cruise set 75, truck just stopped running 4 days ago and has not started since. Fuel if good, went ahead and purchased cam shaft and crank shaft sensors, it has spark and compression but will not start. No codes . Mechanic said there was long delays in checking things in his snap on diagnosis tool. So he had me get another pcm which ii have and installed and literally nothing changed hour after trying went back out to truck and did the three turn ignition for codes and now says oil pressure sending unit, i am at a complete loss. I call the mechanic and tell him what has happened and he says iguess it's in the wiring and suggested i go and get a complete set of every wire harness on the truck and replace them all. I am looking for any help or suggestions please help me out

 

Verify spark on more than one cylinder.
Verify fuel pressure with a good gauge.
Verify you are getting injector pulse. (noid light)

Take it from there.

 

I appreciate it I'll sure give it a try