So this weekend was the first time I had the car on the road for a decent highway roundtrip. I decided to try out the cruise control to see how it worked. It worked, but the problem was it kept accelerating/decelerating +- 2-3 mph after it was set. Any thoughts/insight on how to fix this issue?

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1985 300D
1987 300SDL
1970 Jaguar E-Type OTS
2002 Dodge Intrepid (Traded In)
2011 Ford Crown Victoria