STN_Pat

Ok small and fast question before i get the ****** to the garage (not the 4th gen anymore, now a 5th gen owner forget bout the avatar...)

Went back home from gf place earlier today...stopped at a stop (duh) and heard weird noise. The car is running on 3 cylinders and there's white fume coming out from the back.

I was just wondering what could be the problem before going to te garage ?
No temp. problem
No warmer problem
Motor ate few mL of prestone
When i added some it started making more white stuff @ the back

Did an engine bay clean up 2 days ago, and today was damn rainy.

My supposition :
water into spark hole
distributor cap (water in)
could it be as bad as a headgaset ?

Can't wait to get and answer ! HT rocks !

ps : Please pardon the bad english
<--- french ****