Many things can cause your engine to stall while driving.
Running out of fuel will obviously cause your car to stall.
A Transmission Fluid leak, causing your car to run out of transmission fluid will cause your car to stop where it is at.
If your car battery dies your engine will stop. This could be from a bad alternator or from corrosion or bad/loose connection.
In the fuel line, a bad fuel pump, not allowing fuel into the engine would cause engine failure. as could a clogged fuel filter.
Other possible causes for your car to stall include
Bad spark plug wires, problems with sensors, ignition problems, plugged exhaust system, starter relay problems or problems with your vehicles computer system.
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