Abstract: A throttle body for use in the air intake system of an internal combustion engine having an idle speed control. The throttle body assembly (10) includes a throttle plate (18) mounted to a throttle shaft (16), which is, in turn, mounted to a throttle control lever (20). A bearing member (30) is coupled to the throttle control lever (20). A motor (32) is mounted relative to the throttle body and includes an idle control cam (36) mounted to the motor shaft (34) so that the bearing (30) rests on the cam (36). A circuit (40) actuates the motor (32). This arrangement provides a variable idle stop for the throttle plate (18) where the cam (36) is directly controlled by the motor (32). The motor size is minimized by providing an overdrive function that overdrives the motor (32) during transitional phases, to obtain fast response time and high resolution of idle control.