The truck stalled as soon as the scan tool booted? Related? Or coincidence?Truck started and ran until the scanner booted and shut off.
Do you have spark? Have you checked with a spark tester calibrated for HEI at the end of two or three plug wires?I sprayed the TB with starting fluid and it didn't even try. Had my amazing and flexible wife replace the ICM for me. She noticed the screws on the cap only got finger tight and nothing more, just free spinning but cap was tight and not moving so we resumed. Same crank no start, but fuel pump relay code came up, I just so happened to have one and swapped it. No change. I am still at a loss.
Do the injectors spray during cranking? Does the pump prime? If you crank long enough to build oil pressure, do the injectors spray? Do they even click during cranking?