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Q: How do I remedy a P0303-cylinder 3 misfire. And how do I repair on 2004 Kia Spectra

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The car is having a hard time shifting, automatic, especially when the ac is on.
(1) Answer
Swap #3coil with another cyl.See if misfire followes coil.may want to swap plug as well.
With engine under powered,trans.will seem slugish.