This weekend, I cleaned and lubricated the 3 throttle connections on the top of the engine. Are there more? As the speed surges, the speedo changes about 2 mph, the rpm 100 revs and the throttle pedal moves a bit. All changes are at the same time and rate. After 15 minutes, the surging stops and the 450SL cruises steadily. Am I looking at black box change?

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