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What could cause the engine to shut off while driving down the road?

(1994 Mazda B3000)
in Austin, TX on September 19, 2012
I was driving down the road on my way home when the engine suddenly (for no discernible reason) shut off. I was able to maneuver it off the road and into a parking lot. I tried to restart it, but that didn't work. It would turn over, catch, then stutter and turn off again. There is over half a tank of gas in the car, and the battery cables aren't loose or anything. I flipped the fuel pump switch a few times (located under the dashboard on passenger side) but that didn't help with restarting. Puzzled as to what could be wrong.
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Popular Answer
of Greg's Orange Auto on September 19, 2012
ignition issues sseek a diag and est
on July 24, 2013
Did you figure out that problem? Mine is doing the same thing. Initially I found broken vacuum hoses from the PVC valve. After I replaced them it stopped doing it... Until recently. I think it's one of the sensors. The guy that answered you said diagnose but it would have to be hooked up when the problem is accruing. Let me know what you did please. So frustrating.
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