I agree with the modulator and also suggest checking the plastic vacuum line and the rubber tubing connector going to it.

Someone else had posted that they simply replaced the rubber tube and it drove like it was new. On a car that old, with all the heat etc. they get brittle and hard. I would simply replace it. Easy to do. Watch taking it off the vacuum modulator as they can "bond"on. Also the plastic on the modulator may be brittle as well.

AND yes, ATF!

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)