Shaker leaking on ignition coils

[sirhada]

My Mach 1 was parked outside for a few months and when I started driving it again it ran like crap and when I went to change the plugs I found the coils on the right side sitting in water! I cleaned them up and changed the plugs and it worked fine until it was left out in the rain again. I cleaned it up again and it ran good for a few days then started skipping. I'm guessing one of the coils is bad and I have not found a satisfactory way of testing them. Other than buying 1 and swapping them 1 at a time anybody know a good way of testing them?

 

[Revvv]

Are you getting a code? If so, you can swap the coil for that cylinder to a different hole. If the code changes you know which coil to change.

Sent from my SM-G900V using Tapatalk