Last week I got cel for P1320 which is igntion coil and P0304 which is cyclinder 4 misfire. I originally was going to replace that coil but since I haven't chance my spark plugs I decided to do that first. I replaced with oem NGK platinum ones. It's been couple of days and no cel light or anything. Not sure if this going to work for everyone but it's a option.

 

I think anytime there is a misfire the computer assumes it is the coil...

Good for you it was just bad plugs! much cheaper than coils.