97 prelude white smoke?

yeah i have a 97 honda prelude and its blowing out white smoke from the taill pipe only at a stop and go such as the smoke is stuck in the muffler and as i take off it blows it out i got it checked out at like 4 different shops and they dont know whats wrong with it if i gas it to like 1 in a half thousand rpm it does not smoke at all but if i was to be idleing for like a minute or so then take off its a big cloud off white smoke but as driveing it does not smoke i know that cause i let someone drive my car as i follow them on the streets and the highway if anyone have the same problem or have any idea wats wrong with it please let me know thanks