1988 Chevrolet Silverado won't start

If the engine is running on starting fluid then there is a fueling issue.
Have you checked fuel pressure? It should be 9-13psi
Disconnect all the fuel injector electrical connector(s) with the key on. Apply a power wire and a ground wire briefly to injector and see if fuel sprays out of injector. Do not do this test too long as the fuel will flood the engine too much fuel will hydro lock the engine so take care. Do not apply power or ground to the harness side injector connector. Check for any resistance with a multimeter you should be getting resistance from the coil windings inside each injector. Check for voltage on one wire and ground signal with the engine cranking. Noid testing lights will also show if there is grounding controlled by the computer.