I recently bought a 2003 C230 coupe with 120K miles on it from a very trusted source. The car runs fine when cold, but misfires when reaching normal operating temperatures and the check engine light comes on. I brought it back to the shop I bought from and we discovered that the # 2 coil well was full with fluid and #1 had some in it as well. There was no oil residue or antifreeze "feel" or smell to it; felt like water. We thought that maybe someone had washed the engine, hence the water presence. We vacuumed it out and allowed everything to dry thoroughly before putting it back together. Following that, we ran the car for about 45 minutes and then drove it home for less than 10 miles and parked it. Yesterday, I drove the car and within 30 minutes it started misfiring, check engine light came on and #1 is full with fluid again!!!!!!!!!!!!I am stumped. Does anyone have any ideas?