Water were the spark plugs are?? And running high revs when engine in warm?

Hi peeps
My mk5 2000 1.6 zetec s started juddering so I changed the coil pack but was fine for about a week started doing it again I pulled out one of the ht leads and noticed water in there I soaked as much as I could up started the engine and it was running fine I took it out for a spin it seemed okay but was running high revs I also noticed the water was running out I toped it back up and left the car. I stared it the next day and left it running for a while tured it off done the same the water had come back??? And still runs high revs?? Any ideals on what it could bee???

Daniel
December 2013