5.3 won't start, ideas?

[OKGMC4]

Just got to this point and no go. It's an 01 all stock, stand alone harness from a dealer in TX, and an ECM reflashed for street rod use from SpareECM on ebay. The fuel pump powers on but when I crank it doesn't seem to get spark at the plug wires and my noid light shows no pulse at the injectors. I checked and I do have power to the ECM. I've got to be missing something and not sure what? Any ideas appreciated.