My S14 is doing something similar. It finally threw code 21, which is ignition signal. It only does it when it hits a good size bump or when I brake hard. The car just dies, but if I have any momentum, it starts right back up. If I brake hard to a full stop, I have to restart the car. I'm thinking it must be a loose connection somewhere. I still have to hunt it down. It's either wiring and/or connectors to the distributor, or the distributor itself.
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