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
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Thursday, January 19th, 2023 AT 7:52 PM