i bought the used 97 sx200 last month. as the weather is getting hotter those days, i found the idle speed very low as 500 or 600 in the afternoon, but normal as 1000 in the morning and evening when it is cool. and sometimes the idle speed is changing from 800 to 1000 within 5mins as the temperature getting higher. what might by the problems? is it possible to be IAC? let me know your opinions!