I had the same problem like you had. High idle and rough. also water's coming out of the tail pipe. there is only one thing that I did and it works. take the head out and take it to a machine shop and have it shave.I know for a fact that when you have a head blown gasket it usually mix oil with water. But remember that it's not always right. I have experience it with my crx. give it a try i know it will work. lot's of work but it will be worthed. also change your valve seal in the mean time you having it shave. good luck