While driving the engine backfire and shut off, will not start?

1991 CHEVROLET 3500
400,000 MILES • 7.4L • V8 • 2WD • AUTOMATIC
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CBRADIO.COM
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Was driving my vehicle listed above c3500 60 when I heard a backfire and then the truck just quit running. Had plenty of fuel in throttle body (maybe too much fuel) kind of weak fire. Replaced rotor button cap and coil. Great spark and still fuel in throttle body (a lot of fuel). But it will not start or run.
Sep 27, 2022 at 4:28 PM
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How does the engine sound when cranking over, normal? If you can upload a short video of the engine cranking, I can tell if the engine is okay. Also, turn the ignition key on without cranking it over. Can you hear the fuel pump come on for about 5 seconds in the fuel tank?

This guide can help:

https://www.2carpros.com/articles/car-not-running-advanced

Also, let's run the codes please follow this guide:

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

Please go over these guides and report back.
Sep 28, 2022 at 4:32 PM