hi. ive got a rather strange problem. ive got a 94 civic ex d16z6 vtec. the ac blew cold and worked fine when i got the car yesterday but today i took it for a drive around the city and eventually the ac stopped blowing cold and the idle started jumping up and down like the iac valve is bad or it has no tps or a theres a vaccum leak. but what i dont understand is that when i turn the ac on is when the idle is jumping and turn the ac button off it idles fine. but when i turn the button back on, it starts jumping again. any ideas? thank you.