Hello Guys! I'm new to this forum but ive come across a problem i dont know how to fix. a month ago (when i got my mustang) I had the error code p0303, cylinder three misfire. i replaced my plugs and wires however on spark plug three there was coolant on the threading. Its been a month now and i got the code again, and its a rough idle once more. I checked for water in the oil and the oil is free of it, there is no smoke out of the tail pipes and i dont smell any weird smells nor is there a big lack in power. when i pull the plug its got reddish brown burn on the right side on the white piece and redish brown grit on the threads. Any idea whats causing this? ive owned the car 3 months and its loosing coolant but nothing leaks on the drive way. but its not a huge amount of coolant just enough to notice over three months. i have pictures but do not know how to post them :/ (1996 v6 coupe 180,000miles) any help is appreciated!