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There is a spindle sticking out of the side of the throttle body, which opens and closes the throttle plate. On the end of it are two throttle quadrants, either of which can have the end of the throttle cable attached to them and they each act independently on the spindle. Why have both?
The ECU controls idle revs with the idle air control valve - the throttle itself is not involved. Cruise control makes more sense, although I've never seen a Scoob with it.