TBI Pulse going nuts tachometer twitch

Truck listed above is a c3500hd.
As I start truck it doesn't start; I look at TBI barrels are filled with gas. I pull pulse sensor on top of injectors start truck reinstall pulse sensor on truck with a good amount of rpm's pulse is erratic and fuel injectors spray skipping. Ides high then low, I know it's something with pulse or maybe bad injectors or faulty ECM.