Hi,
If you have fuel pressure to the throttle body injectors, either there is a wiring issue, or the ECM has failed. Each fuel injector is a solenoid-operated device controlled by the ECM. If you look below, you'll see that the ECM is what controls the injectors.
First, check the inj A fuse. See pic 2 for the location. When you check the fuse, also confirm there is power to and from it.
Here is a link that you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Next, I would recommend checking for diagnostic trouble codes. The truck has an OBD1 system that doesn't require a scan tool to get codes. All you need is a short jumper wire or even a paper clip.
Follow the directions in this link:
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.
Take care,
Joe
See pics below.
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Tuesday, January 17th, 2023 AT 8:13 PM