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cruise control on 1991 Mercedes-Benz 350SDL

My cruise control works but it will not stay engaged for more than a minute. Any thoughts?

Asked by for the 1991 Mercedes-Benz 350SDL
This is likely a vacuum operated cruise control system, so check the system thoroughly for vacuum leaks.
ok thanks!
1 more answer
This is likely a vacuum operated cruise control system, so check the system thoroughly for vacuum leaks.
ok thanks!