Fuel pump relay caused the sudden shut-off problem on my car. One way to test the relay is to bring the car up to temperature, open the hood and whack the relay with a screwdriver. If the engine shuts off, there's your problem.

Another possibility is the OVP relay. They can cause strange electrical problems like that, especially when you lose power windows as well as engine.

If the engine runs it's pretty much not the ignition module. They either work or don't

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Streetside: 1987 Mercedes 300E Petrol Blue/Green
2014 Ford Mustang Grabber Blue
1999 Ford Ranger Green

Dockside: 1968 Eltro 17
1985 Silverton 34C