Will not fire

Back a few weeks ago, changed the head gasket on this car. Took out for test drive, was running great, all of a sudden it shut off. Got it back in the garage and discovered it's not firing at all. Changed the ICM, all the coils, new plugs and wires and crank sensor, still wont fire at the coils or plugs.
noticed the two wire crank sensor plug going into ICM had some bare wire showing and replaced it in case it was shorting out. Still no fire. Kind of stumped as to where to look next for the problem. All fuses are good and intact in the fuse box. Car turns over, getting fuel, just wont fire, any suggestions on what I may be over looking? Another odd tidbit. Car owner said this had done this to him before and he jiggled the gear shifter (column) and it would run after that, I could not reproduce this on the car so far. Thanks in advance!