There is also a lot of information in the archives to add to my post.
Here is a result of the words "vacum leak" under the user name "Arthur Dalton".
He has a car like ours and has posted frequently on vacum leaks and the sources of problems.
http://www.peachparts.com/shopforum/search.php?action=showresults&searchid=943321&sortby=lastpost&sortorder=descending
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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