The truck lost all power the other day driving and barely made it to work. On the ride home it was still running horribly, like it just fell on its face. the check engine light came on. Went to autozone and put HEET in the gas tank cuz the night before it was at quarter tank and temp went from warm to freezing(thought maybe condinsation in tank)..Truck ran alot better( not perfect). Drove around that day and it was fine. Pulled down the driveway and CE light shut off. Ran the code anyways and it was P0012.. Talked to a few mechanics and they said try replacing the Camshaft position sensors..did so and it ran worse. the truck hardly would idle or rev and shook vilantly..i shut it down right away. Then it threw 9 codes..Cam shaft position- over retarded timing bank 1(P0012), misfire cyl2, misfire cyl3, misfire cyl 4, random misfire, cam sensor bank 1, three of them were repeated codes.. I replaced the sensors back to stock and cleared the codes. the truck is running like it was in the beginning of the problem..No vilant shaking but falling right on its face at idle and any rpm..not drivable..ANYSUGGESTION BEFORE I TOW IT TO DEALER..would rather do the work myself. very capable except for replacing camshaft phasers which i have heard could be the issue..Could it by the VCT seliniod, EGR valve, plugs, wires...Did just change the oil a week ago and cleaned and reoiled air filter.