Truck keeps stalling in runs rough at times?

2004 CHEVROLET AVALANCHE

160,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC

DOUG STJEAN

MEMBER
1 POST

At times it will run perfect then all of a sudden run badly stalling, believe it or not when it's in that mode if you jack up the driver's rear a little bit it will run perfect drop it down truck will shut off. It's the craziest thing I've ever seen, I've done a lot of things to it. Nothing seems to work please help me.

Jul 26, 2022 at 10:17 PM

STRAILER

✓ASE Certified Mechanic
54,837 POSTS

It sounds like the fuel pump is going out. Have you run the codes? Here is a guide to help us:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Next, we should check the fuel pressure when the engine is not running correctly and if no good replace the fuel pump, I would use an AC Delco unit.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

You can rent a gauge kit from the auto parts store. Here is how to change he pump out in the diagrams below. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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Professional Diagram for 2CarPros Members
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Jul 27, 2022 at 11:11 AM