I know that many of us have Cruise Control issues so I figured I would throw mine out and see if anyone can tell me what I need to buy to fix it..

When you go to engage the cruise, it will engage but start creeping up maybe 10mph quickly and then it drops.. Grabs and goes up again and drops causing a surging... Any ideas???

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1991 350SDL
1978 300D
1995 Chev Conversion Van
2001 Mazda PU
1966 Chrysler New Yorker
1994 Lincoln Town Car