Thanks. I understand what you are saying. My scan tool only has freeze frame, does not display live data. How else can I check this? By spraying around intake with carbuerator spray, and see if idle smooths out or changes? If fuel pressure is low, is that the pump or pressure regulator? (Yes it is a 5.3L)
Thanks again for the quick response, I'll try these things in the next couple days.
thank you so much