Shut off while driving, engine cranks but no fire?

I was driving and it just shut off, will crank but won't fire.
I have replaced the coil pack, crankshaft sensor, camshaft sensor, computer/ PCM,
Checked wiring harness for burnt/damaged wires, checked fuses and relays multiple times. No check engine light, battery went dead took off to charge, I need help
This is driving me nuts.