GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi there, I am Cam.Sorry to hear about your issue. Can you tell me if you checked the fuel pump pressure?
Ok I Would start there. Pressure should be between 60-66 psi. IF the pressure is low, we may have a bad filter, bad regulator on the spider assembly, bad spider assembly or a bad pump. lets start with the pressure.
Did you program the PCM to the 5.7 or the 5.0?
It requires first the Vin of the 5.7L truck and then their programming tool. ITs not something you can do without it.
Given that I work at a dealer, I would get it at a dealer.