Control mechanism for engine throttle position

A pair of coupling elements (38,44) connected between an electric stepper motor (56) and an engine throttle (12) are selectively engaged and disengaged by a lever mechanism (72) which effects a relative movement between the coupling elements in response to an mechanical input from a solenoid actuator (98). The lever mechanism includes integral elements for calibrating the relative movement between the coupling elements for a given mechanical input from the solenoid actuator so as to compensate for manufacturing and assembly tolerances of the various components.