I'd start with the basics: Fuel, air, fire. The engine needs all three to run. Eliminate them one at a time as problems, and go on to the next.

In your case, you have multiple systems shutting down, all at the same time. I'll hazard a guess, based on my daughter's experience. She was driving down the road at 45-50 mph, and her engine died, just like somebody turned out a light. Car is a '92 Camry. The engine would spin with the starter, but nothing more. She had the car brought home on a stretcher.

Her Camry engine had broken a timing belt. The internal parts of the engine were no longer connected. The starter would spin the engine, moving the pistons up and down, but the camshaft wasn't moving the valves and the distributor because there was no timing belt to turn the cam.

I replaced the timing belt, re-aligned everything in the engine, and its been running well ever since.

Just a thought, one possibility on the problem.