GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hello, Eddie here and I will do my best to help. Have you checked the fuel pressure by chance when it's acting up? Also, is the check engine light on now when it is running? If so, do you know what codes are stored? thank you.
Alright, These really like 35 psi running of fuel pressure, the spec is 40 -47 psi key on engine off, and 30-44 psi at idle, it should go up slightly when you crack the throttle. I would check the fuel pressure just to be sure it isn't low, You can probably get a local auto parts store to loan you a gauge like auto zone or oreilly. I would do that first just to rule it out.Is the check engine light on now when driving or is it out? thanks.
That's interesting, has it got factory exhaust manifolds and exhaust system? Is the catalytic converter on it?