Registering Codes - U1000, C0055, C0244, C0268, U1064, P0014, P0327, P0335, P0336, P0621.
Parts recently replaced; Crankshaft Sensor, VVT Solenoid, Exhaust Camshaft Phaser, All timing chains, oil pump, new upgraded oil sump and oil pan, all new main and rod bearings, 3- new connecting rods, new gaskets, new water pump all idler pulleys and belt.
Truck starts great idles great but stalls when accelerating moderately around 2200 - 2500 rpm. Feathering the throttle slightly keeps the truck running. Once past this point truck will accept full acceleration. Truck seems to have less power than before engine rebuild. About 5 months after rebuild once engine warms up oil pressure light illuminates and oil alarm sounds. Checked pressure with gauge and found pressure to be 60 psi at 2000 rpm and 8-psi at idle. Can't make sense of all codes, any thoughts
Well the main thing is you have communication codes which means either the wiring on the vehicle has gone bad or the computer modules themselves have gone bad it will take a guy with a GM dealer level scan tool to do bi-directional testing to see where the failure is it could even be the main computer
