My 1980 450SL has a surging cruise control. Approximately 2-3 mph at 40-75 mph, and the surging stops after about 8-10 minutes of driving. What should I be examining or where should I look? The vacuum system, the control or the linkage? Thanx in advance, Roger

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Roger
1983 300CD 246k sold
1998 C230 52k
1980 450SL 75k needs AC
1999 Subaru Outback Ltd 43k