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2012 Kia Optima EX
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It's a fuel or spark issue ! may be a sensor. Do you use top tri gas with an additive???? may be carbon built-up back of valves if you don't.
1. first test when it will not start spray starter fuel in intake see if it will start if it does then a fuel problem.
2. if not fuel try this. pull one spark plug ground it on the engine then crank it to check for spark.
 
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