Ok so I bought a 91 k2500 5.7 manual tranny. Ran good for the first five days then died. I replaced the fuel pump relay and fuse, fuel pump and module, ecm and distributor which includes a new ignition coil. The problem I'm having is that 1. The fuel pump doesn't prime and 2. The injectors will not pulse. I've tested the injectors with a couple jumper wires they open. I could use some ideas. I should add that the injectors aren't receiving the pulsing ground, and that I tested those wires for continuity from plug to plug between the injectors and ecm and ecm to distributor and they are fine.