Wet spark plug

[2VGTStang]

Hey everyone Im new to the site I need some advice I have a 03 mustang GT Im having a issue so 2 weeks ago car starting having missfire it was cylender 8 I have new plugs and have already replaced 4 coils anyways I changed coil ran little better but was still missing I took plug out it was wet so i replaced it ran good for 30 minutes started missing again I drove it home from work ran good untill I was halfway home then there it went again next day it was perfect has missfired since almost like it just fixed itself now 3 days ago my radiator cracked while driving antifreeze everywhere I put new radiator in yesterday but now cylinder 1 is missfiring it runs good first 10 minutes but after that it start missing I pulled plug and coil out and they we're wet guy at work told me it was water but he just glanced looked more like oil so I cleaned coil replaced plug started car before I put plug in to blow water out anyways same thing when the car heats up it starts missing if I shut it off start it up while it's hot it missfires bad it will clear up some while driving but still missfires could it be intake leaking or what else might cause this I haven't tore anything apart yet sorry for long thread just want to see what everyone else has to say about this