my 97 2.5 liter manual wrangler has had an annoying problem the last week or so. after it warms up, it starts squealing at idle (almost like a loose belt, or a tea kettle) but it's not the belt. it makes this sound very loudly as i idle down the road or between shifts when i let up on the gas pedal but stops when i give it gas again. i suspect it's some sort of vacuum leak. i thought it was the idle air control valve which made sense to me in my mind, so i replaced that and it's still doing it. i cleaned the throttle body and inside the iac as well, and i replaced the tps a couple of years ago, although i don't think that would have anything to do with it. my performance is not affected. it just sounds like i'm driving a giant blue tea kettle. i tried the search and found 2 other similar posts but no one replied with any possibilities. hope somebody can help me!!!