99 2500 quadcab shortbox 2wd nv4500. Okay here goes, a couple of weeks back my fuel pressure was running a little low , so I thought fuel filter, changed that still no improvement. So I thought I would set the computer back to stock. Wiped the ecu. Had the local dodge dealer reflash it. ran good, but still fuel pressure issue, starts out 10 to 12 psi and slowly will work its way down to 0. Changed fuel filter again started truck and immediately died, did not start again. Towed back to dealer, they said injection pump. They could not get it started! My son checked all electrical connections, all good. Opened three injectors got it to start and run, but rough. Ran a code reader, had p0336, changed crank sensor, ran great for about 2 hours, great fuel pressure! Started running like crap again, showed p0336 and p1690 changed crank sensor again no change this time. Need help, don't know if dealer messed up my computer or what is going on!!!