Have you checked the fuel pump Relay? I'd start by replacing that.
Do you have any way to check fuel pressure? If your pump is on it's way out or defective it might be drawing too much amperage (possibly frying your relay) and not producing adequate fuel to the injectors causing the PCM to fault.
Just some guesses, but a relay is cheap to try.
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'69 RS Camaro
'99 SWB Silverado LS "Beater"
'01 GMC Sierra 2500HD LQ4 (Turbo build)
'04 GMC Sierra 2500HD 4X4
My '69 Camaro Build Thread
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