The cruise control system is controlled by engine vacuum, like many other engine components. A split in one vacuum line can cause an array of devices to stop functioning properly. A visual inspection is usually the best way to start, but vacuum gauge is the best way to determine if all the lines are receiving proper vacuum. They branch out from the vacuum tree, adjacent to the throttle body. The tree feeds various vacuum controlled devices, boosters, and solenoids. Older vacuum style cruise control systems have a large control actuator which can be tucked away between the engine block and the inner wheel well. Here is an illustration which may help.
It also doesn't hurt to check the fuse or relay for the cruise control system
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