Engine does not crank?

I was driving from a stop and right before it changed to third gear, I had a backfire and truck cut off. It has been 2 weeks and still doesn't crank over and I have changed spark plugs and wires, distributer cap, ignition coil. I have fuel coming out TBI injectors and even tried starting fluid and still nothing. I have also cleaned every ground wire and checked if wires were good and not busted inside.