99 Mustang GT 35th anniversarylimited edition 5spd.

Well recently I decided to wipe down and clean the engine compartment and clean the battery terminals. The problem is that I got spilled a little water over the heads right where the "coil over plug" systems are at. I cleaned everything up as I thought,but the next daythe enginestarted to sputter. Turns out cylinder 5 was misfirring which just happens to be the one closest to the battery. I removed the coil pack thinking that a little moisture still resided but to my suprise was antifreeze in the hole with the spark plug submerssed in it. I have never seen this before so I do not know what is causing it. I cleaned everything out but the sputtering still exists. HELP!!!

 

first your gonna have to fix the leak then install a new plug and coil. when the coil is submersed in water or coolant it over stresses it and causes it to fail.