96 PSD acting up- a little help please
I'm trying to help someone get there truck back up and running. The guy called me and said it would start, run for about 30 seconds, then sputter and die. I took a look at it and hooked it up to AE, everything checked out fine but the ICP was all over the place, so I swapped the IPR with my spare and she lit off and ran like a champ. It needed a glow plug relay and I had to get going, so I parked it and told him I'd come back later and swap the relay out. When I did we tried to fire the truck up, and it wouldn't start. It would barely run at all, then sputter and die like it was starved for fuel. It would only restart if I shut the key off; if I just cranked it over again it would only crank- no fire. I fiddled with it and finally got it running again, he drove the truck into town and back (about a 10 mile trip) and when he got home he had it idling in the driveway and it sputtered and died again. Fuel filter is new, fuel pressure is good, no codes, new CPS, everything else checks out. The oil was about a quart low, not low enough from my experience to cause it to shut off and even so, that's normally a quick shut off like you turn the key off; not a sputter out and die situation.
I'm at a loss but I promised to get this rig back on the road. Any help would be appreciated.