car stalls once in a while on 1991 Ford Taurus

well i was driving home and i was at a stop light and the car was idling rough then it started to stall i pressed on the gas and it didnt stall drove good home.car sat all day then when i was comeing to work the first stop sign i went to the car tryed to stall again but it drove to the next stop sign then it finally stalled out..tryed to crank but didnt let it sit for bout 10 mins and car started up again.
WHAT COULD THIS PROBLEM BE???????

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