Could it be as simple as a bad batch of fuel? Cruddy fuel and clogged filters would explain what you are seeing.

If you came in near empty and then filled up with a full tank of bad fuel it would explain the sudden onset.

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.