I've had a few electrical issues in my LBZ so about a month ago I ended up Swapping out my ECM, TCM, GPCM, and BCM and everything seemed to work great again. week or so later my HVAC resistor went out and my fan for my A/C would not work. Changed the resistor and about a week later is went out again. just said screw the A/C. Then had some intermittent problems with fuel, Rail pressure would shoot up to 27K-28Kpsi at idle. Tried changing Fuel Rail Pressure sensor, still same issue. Instead of just changing Fuel Pressure Regulator, I went ahead and changed the whole CP3. Crank it up, still over pressuring. Checked all the wires for the FRP Sensor and the FPR all the way back to the ECM connector and the wires are fine. I've gone over, checked, inspected, cleaned, every ground wire I can find. There's less than an Ohm of resistance between the both batteries and the frame. I don't know what to do now. My only thought is to try another ECM and see if its acts right, any other suggestions?
