GMC Troubleshooting Questions? Ask a Mechanic for Answers
Welcome, I'm Chris (aka Moose).
I am wrapping up the end of my shift. Sorry I nor any others got to you sooner. I believe I can help on this concern mid day on the 11th if help is still needed.
I think someone has spliced into this circuit, because its not used on a 5.0. Can you see what is missing like ignition spark or fuel pressure?
Hello again Chris here,