It started with a longer than usual crank before finally starting. Then it wouldn't start. It turned over and over, but wouldn't start. A local shop had it for a couple days trying to recreate the problem. No codes were being thrown. Ended up replacing the fuel pump and crank sensor. Still intermittent starting issues. Also replaced the ignition switch.
Things ran fine for about 2 weeks. Then it just shut off as we were driving along the highway. Wouldn't start again. Got it home and replaced the plugs and wires. Still intermittent starts. I got it running, drove it around and then stalled it and it was back to not starting. Still no codes aside from CO2 sensor.
Recently did a compression test and cylinder 2 is low compared to the others. Would that be enough to shut it down and not let it start up again?

I have Milltek headers and exhaust with Alta CAI as mods.

Any thoughts?