Engine stall

It should not be too terrible difficult to diagnose. The engine needs compression, spark and fuel to run. You need to figure out which you are loosing when the engine stalls A scan tool attached to the 16 pin diagnostic socket drive the car look at live sensor data. When the engine stalls sensor data can be read to see if the computer sees engine revolutions, air entering the engine, ect.... A car like this I tee into the fuel line tape a pressure gauge to the windscreen and monitor pressure as I drive see if it fails when the car fails. I would look for vacuum leaks as well. When the car stalls I would look for injector pulse (on a professional grade scan tool you can look at injector pulse).