Bad Idol?

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I have an 89 CRX HF, and it has had a really weird idol lately... I juss got it tho... but i start it and it runs fine at 2k when its warming up but then after it warms up it goes down to bout 1k RPM and keeps revvin up slowly to 1500 rpm , but i was jus wondering if someone could tell me what was wrong with it and how much it is goin to cost to fix it... THANK YOU
maybe an idle sensor, but I am not sure on that car. Does it do it when you drive it after it is warmed up and you put in the clutch and let idle? I have same problem and was told it is the idle sensor.