My car idles at 750 when it is at normal operating temperature. 750 feels like a rough idle like maybe its missing. If I turn the fan for the heater on, it idles at 800 rpms and i cant hardly feel it idle becasuse it is so smooth. When I bought the car almost new, you couldnt hardly tell it was even running. it always idled at 800 RPM, is there something I can check or set to get it back to idling at 800 rpms always. My car is a 99 Cobra. Any help would be appreciated, Thanks alot, Dale