Took to dealer , they replaced 2 fuel filters, said they checked fuel pressure, ok. Does same thing , fuel injection sensor still reads 650 psi while truck is dying out, this takes about 1-2 mins,during which you cant get any respons from pedal , specs say you need 450 psi min. so that looks good . cant find schreider valve to check pressure. new update engine is backing injection duty cycle from 35% at idle to 10 % lenh dies, after 2-3 hrs on & off running , found .0 map reading , has no vacuum at sensor , kind of feel like pulsating back & forth. I can get running if i move duty % up to 35- 50% manualy with my computer.