kinda sounds like your having more than a IACV issue. i would have ask if you have any codes... which i would hope you would tell us. more info is best. this and that doesnt do shit, just saying. but yes sounds like your have a control sesnor issue like a map sensor? dik hondas to well but yeah. high idles usual means a limp mode or fail safe mode. like a bad map and its just says oh high idle because i dont know whats going on in the manifold. but yehah...