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cruise control

Electrical

Model: 944, Year:85.5, Mileage:130k, Type of use:Street use only
My cruise control acts erratically. The control unit was replaced with another used one supposedly in good working order. The cruise control will engage but then it will hunt for the set speed, decelerating to 5-8 mph below than accelerating to the same above. Did this before replacing the control unit, too. Any ideas where to look for the culprit?

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