I really am determined to diagnose the problem, and not just keep throwing new parts in it, but I have to be missing something. SO far (besides starter), in order; new racor fuel filters (due to slow start), replaced STC fitting (slow start came back month later) did EGR delete while I had it apart, EGR cooler hose, manifold gaskets, (started & quit the same nite, hasn’t fired since), cam sensor, FICM, ICP Sensor, checked every inch of every engine wiring harness & re-taped all. Voltage at IPR harness is 12.4/9-10.5, fuel pressure = 45, low side oil pressure = 70+ (cranking) Hi side oil pressure = 80-100, builds very slowly.