Check engine turned on and then engine shut off

I was driving down interstate and check engine light came on. I pulled off and turned truck off. Checked everything over and filled up fuel. Got back on interstate and exactly 4 miles it was like I just turned the key off. It back fired 1 time while I was still coasting. Troubleshooting on road side I had a friend bring me a crank sensor and that’s where I made my mistake. I didn’t have my scanner with me and didn’t think about it at the time, but I unhooked they battery when I installed the sensor. So whatever code I had, I lost it. Long story short, 3 weeks later and it has not fired one time. I’ve replaced the cam and crank sensor, ignition coil, went through the PCM pin out, done compression test, checked the ASD circuit, have 50 psi fuel pressure when cranking, it drops immediately which I’ll fix it I don’t set it on fire first, checked plugs and wires, checked cap and rotor, swapped battery because at one time while troubleshooting I got a battery temp sensor code, I have my battery voltage on back of the alt for the 1 second when key turned on and while cranking, also have that at coil and injectors, have 5v at the cam and crank sensors and pulse. Am not however getting the no com message in dash, otherwise I’d think the PCM is faulty. However I cannot get my scanner completely work. It connects, says no codes which there aren’t, but it won’t read VIN or sensors. It will read the coolant temperature and air temperature and atmospheric pressure but that’s it.