How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Gm Tech (Cam) Your Own Question
Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 29516
Experience:  GM Grand Master Technician 2007. 14 year experience.
Type Your GMC Question Here...
Gm Tech (Cam) is online now
A new question is answered every 9 seconds

I have a 1999 GMC Serria 1500 series truck it had a 305

Customer Question

I have a 1999 GMC Serria 1500 series truck it had a 305 engine in it but I bought a new 350 engine and put in it and bought everything brand new and replaced all parts and put a new computer from a 350 and it still seems like it wants to stall or don't get enough gas. What could it be I've tried everything.
Submitted: 1 year ago.
Category: GMC
Expert:  Gm Tech (Cam) replied 1 year ago.

Hi there, I am Cam.

Sorry to hear about your issue. Can you tell me if you checked the fuel pump pressure?

Customer: replied 1 year ago.
Expert:  Gm Tech (Cam) replied 1 year ago.

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.

Customer: replied 1 year ago.
Ok I will try that. I don't have to do any thing with the computer? I had a 305 computer in and I got a used 350 used computer and put in, so there's nothing I have to do with that.
Expert:  Gm Tech (Cam) replied 1 year ago.

Did you program the PCM to the 5.7 or the 5.0?

Customer: replied 1 year ago.
I didn't program nothing. So how do I go about doing that because where none of dealerships will touch it.
Expert:  Gm Tech (Cam) replied 1 year ago.

It requires first the Vin of the 5.7L truck and then their programming tool. ITs not something you can do without it.

Customer: replied 1 year ago.
Where do you go and get this done
Expert:  Gm Tech (Cam) replied 1 year ago.

Given that I work at a dealer, I would get it at a dealer.

Related GMC Questions