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I know exactly what you are talking about, it will go high to about 2 to 4k rpms, then back down to 1k in intervals of about 3 seconds. It is either the idle air position sensor, or the throttle body position sensor, hondas are famous for it. The parts are cheap, about $20-$30, and fairly easy to install when you find it. I suggest a Haynes Manual for installation to make it a lot easier if you don't know where it is. Good luck, hope all goes well.
I had the same problem in my 97 civic dx. Once the car warmed up it would rev up and down whenever the car was idling over and over again. To fix it I found out that the spring on the throttle body was sticky and by spraying it with lubricant (WD-40 or something similar) and working it into the spring until could stretch and contract freely, I never had the problem again.
well there could be couple problems happened to mine only cuz the troddle position sensor wasn't working properly. so while idling the rpms would go up and down then sometime shut off eventually. but when you mean rev up and down you mean idling irregular? if so your timing belt and or pulley's worn fuel pump not delievering enuff fuel to fuel injection system, leaking egr valve, or even the air filter clogged.