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Q: my car engine turns off at stop light periodically on 1993 Ford Crown Victoria

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Above does not occur all the time. But only when car is not moving. When it happens it is not difficult to restart. No rough idling noticed.
(1) Answer
You might have an egr valve sticking in the open position,or a vacuum leak.Both are very common on this year of crown vic.Another possibility is the torque converter fault.