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1997 prelude appears to be revving from 1400 to 1900 this happens after I turn on the car and warms up. I know this is a common issue. I replaced the iavc valve and I still have the problem. Could it just be dirty?
 

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FITV - Fast Idle Thermo Valve only happens on cold starts.
How to clean it:
How to fix IAVC it (did you replace the gasket? It needs to be sealed tight):
 

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Also air in your cooling system will cause this same idle issue. Bleed the air out of the system. Probably a bleedvalve on thermostathousing or nearby.

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