E320 surging idle.

Hello:
Has anyone had experience with their idle surging ( bouncing) from 150 rpm up to 900 rpm and back again. It started doing this on occasion and is
getting more regular in its happening. It is quite aggravating to have the car act like you want to jump the light sitting next to the racerboy in another lane. I tried the usual check for vaccuum leaks and the HFM sensor, and o2 sensor to no avail. Any ideas will be gladly accepted and inspected. Thanks to all. '94 E320 wagon /120,000 miles
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Did you check your overload relay fuse? Did you jumpstart this car recently before you saw this problem?
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