engine shut off while driving
High-mileage? One possible reason is your timing is off and the knock-sensor is kicking in and shutting the motor off to prevent it from being damaged. Another is a bad electrical connection. Check for a "check engine" light or have the OBD (on-board diagnostics) trouble codes scanned - that can be done for free at most auto parts stores. Just ask at the counter.
It could also be caused by a partially blocked air passage in the engine breathing system or an idle control senor or other air sensor or faulty electrical condition.
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