Wile driving my check engine light came on and I get a bumpy ride like I'm riding on a flat.. I got it checked and found out cylinder 4 is misfiring so I went ahead and changed the spark plug the check engine light went off but it still drives the same. I'm thinking that maybe I should change the coil? What do you guys think?

 

You could always swap #4 coil with #1 and if the misfire moves it is much easier to change that # 1 coil. What do you think?