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High idle conditions could be a result of low coolant levels causing the fast idle valve under the throttle body to catch air and not operate accordingly as it needs pressure built once car is warmed up to close the gap of allowed air passage reslting in lower idle at time engine reaches operating temperature. Or the valve could simply
you say it s a vaccumm problem but dont forget a burnt valve that will make it idle up and down too. I have a 1992 honda accord ex and that was my problem. it was idling up and down too.you can have the compression checked to verify this.