first check all vaccum lines, then check the IACV, and if its not that, check your fast idle thermal valve. Its on the throttle body. There is a bronze colored plate on the bottom that has two bolts holding it in. remove it. Inside there is a plastic round sleeve that is threaded on the outside, and there is a metal piece with a spring behind it in the middle of the white sleeve piece. Thats the FITV. The white plastic piece may have backed out some. Turn it all the way in, and then about a half turn back out. for some reason, honda made the threads stop at the end just far enough that if it backs out enough it will go past the threads and suck in and out, which causes the surging.