I don’t know much about the vehicle your talking about or fords in generally but with some older model vehicles the cruise is controlled by a cable attached to the throttle body. the cable moves freely with the throttle body until the cruise control is engaged. once its engaged the cable holds the throttle in place. if the referenced vehicle has a similar set up then that where i would look first. check to make sure the cable is still attached and not frayed. if the cables is broken then you will need to replace it.
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