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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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.