Put a gauge on it at the pump and set to exactly 7 psi at idle. For the other issues, what is the age of your cp3. I'm to tired to read through all that. Ideally you get 200k good miles from a cp3. Then throw a new one in. But after that point if you still exp the slug except over 2k rpm. Your torque converter is fried. I have the same problem. Just waiting till I can park the truck
Also what intake are you using and what is the age of your maf sensor. I had a code once cause my sensor was bad so the ecm sent more pressure than it needed, which then gave me a rail pressure code. Ten minute fix and it went away.
2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, DSP 5 on v2 by Rick Fletes, 33x12.5 nittos at on 20 inch American Racing wheels, modded factory air box, Profab Intake Horn, Batmo Wheel, Turbo port and polish, Full EGR Removed w/ fed belt, 3.5 inch MBRP Downpipe, Full five inch MBRP Exhaust, 10mm lbz cp3 pump, Dual Yellow Top Optimas, High Output Alternator, Cognito Pittman and idler w/ support kit, Cognito Contol arms, Drilled and Slotted Rotors on all four Corners, Custom Y Bridge.
