You've got a vacuum leak somewhere. If you don't own a MityVac diagnostic tool, get one and start testing. This has been *exhaustively* covered on the forum in various places; just do a search for vacuum leak. Look under the hood for obviously broken, cracked, unplugged vacuum lines and determine (if you can) where they go.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL