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Mine did that from 1000 to 4000 all the time. My neighbor is a mechanic at the Honda dealership and he helped me fix it. Behind my intake manifold/throttle body is an idle control sensor. Keep is mind this is a B-series and I'm not positive about yours. Anyways there is this plastic screw thing that is spring loaded in the housing of the sensor. Vibration tends to back this out causing a internal vacuum leak. You need a mirror so see in there unless you take off the intake manifold. Its a bitch to get back there and thread it back in but I did and screwed it all the way in and the idle went right back to normal. My neighbor said this is a very common Honda problem and he sees it about twice a week in the shop. About two months later it idled ireg. just a little and I had a vacuum line leaking which I replaced and it fixed it again. Maybe this could be it but what other people suggested could be the problem too. A bad sensor would definatley cause that. Have your ECU checked out too.
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