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the car won't always start on 2001 Kia Rio

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I have had the car in the shop three times now. It will not start, it sounds like it is about to the start whines, it backfires and quits. I go back 10 minutes later and it starts but runs really rough and the engine light comes on.
(2) Answers
change battery
If the check engine light is on, then diagnostic trouble codes should be stored. Find out what those codes are and we can offer a more informed response to your question.