when accelerating to pass the motor stumbles or hesitates and almost shuts off?

Hi,

Your description sounds like it either has low fuel pressure or there is something restricting the pressure.

I realize you replaced nearly everything, but I would suggest checking pressure so we can eliminate that as a possible issue. It could be low for various reasons. On the other hand, it could be high due to a failing fuel pressure regulator.

Here is a link that explains in general how to test pressure:

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

Also, if you haven't already, check to see if there are any diagnostic trouble codes stored in the computer. The truck has an OBD1 system that doesn't require a scan tool to retrieve codes. All you will need is a short jumper wire or even a paper clip.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Let me know what you find or if you have other questions.

Take care,

Joe

Thank you for the answer. I plan on replacing the left injector and the two injector connectors this week to see if that will help.

Regards,
Charles Troublefield

Hi,

You are very welcome and thanks for the update. If possible, let me know if that takes care of the issue for you. I'm interested in knowing.

Take care,

Joe