[MIkey52]

With all the p02 codes being common, then I would start at fuse box and try to chase power to one of the injectors. Almost sounds like you have some broken wires or a bad connection in a plug somewhere.

But could be as simple as a fuse. Or relay.

 

[MIkey52]

I don’t and never did have your year model truck, but I remember reading about some early years had trouble in the wiring harness near the alternator.