Q: Why does my car stall?? on 1999 Cadillac Seville STS

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My service engine light is on. i took the car to my local mechanic and he said that it was somekind of missfire code. My car stalls not all the time but today it stalled twice but it starts right up again and rides fine. The car has 84000 miles any ideas?????
(2) Answers
Please post the engine code that would make it easier. Otherwise, could be the spark plugs or coils. Need code please.
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