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Q:

Car shuts off while driving on 1994 Mazda MX-3

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While driving my car shut off. Everything shuts down . But will restart . Has been doing this more often. Could my security system cause this. I also have a drain on my battery while it sits for a short time. Are they connected. Machanic's can not find the problem .
sue
(2) Answers
Security systems don't typically cause stalling. They do cause issues starting. And, a security system can cause a drain on the battery.

I just don't know what to make of the stalling based off of your statements. You could have a loss of ignition spark or fuel system pressure. A tech needs to check the problem as it occurs to see what element is missing.
Alternator, I had the same problem. It starts with stereo shutting off first randomly and then the lights die along with the car.