Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I have a 2003 chevy 2500 that was acting similarly.
When you turn the key to run (just one click before it cranks the starter) can you hear a buzz from the fuel pump for about 3 seconds?
Sometimes it's easiest to hear with a helper listening at the fuel filler door.
Do you have a scan tool?