[OKGMC4]

Assuming you have fuel pressure, that is the pump primes when the key is on, you should have gas to the TBI. It sounds like you have fire at the ignition but the injectors aren't being told to pulse. There is a fuse just for the injectors and there is a power wire for the start AND run key position. I found this out when I swapped TBI into my 79 TA. It would crank but not start unless I poured gas into it. Turns out I had the efi injector power lead hooked to a run lead on the fuse block but NOT to a "start" hot wire. Could be an injector or pump relay as well. Seems like it's the same part number as the blower motor relay. Did that once in the parking lot of OReillys. Switched out the relays and the truck started but I lost the air conditioner. Just some food for thought. Hope you figure it out.