Shut off while driving, the engine cranks but does not start?

I was driving to the groceries store one day and it died out without making any sounds. I checked for fuel and spark; I’m not getting any spark. The real issue is I’ve checked everything I could think of, and nothing has worked. New distributor rotor and cap, new coil pack, new ECM, all new fuses. New crankshaft positioning sensor, all spark plugs and wires and even a fresh battery. I’m still left with the truck cranking continuously without starting and I’m stumped and starting to get frustrated. Something that I haven’t checked or maybe overlooked would be helpful, I’m in a pickle.