[DanEC]

IMO a car with a fuel delivery problem isn't going to run fine one drive and totally shut down on the next one but start back up immediately. Still sounds electrical. I don't know what kind of connection blocks your wiring harness is made up with but as a precaution I would trace all the circuits between the ignition switch and ignition components to look for any pin connectors that are not fully seated in the connection block and not making full contact. Check that all grounds are good and tight. Even check out your coil wire closely and make sure it hasn't been damaged or has a poor terminal crimp. Also check connections at your ignition switch, starter and starter relay.