Just came back from the mechanic and confirmed the following:
Fuel pressure is normal.
The coolant temerpature sensor was changed because he got a code for it on the scanner, and he assumed it burned out because I lost a lot of coolant when the water pump went out and air probably got in the system.
All of the vacum hoses checked out. He even unplugged the servo unit, and that didn't change anything.
He called the dealer for advice and they suggested the throttle actuator (damn it, it's an expensive part).
I guess I'll give Phil at Fastlane a call and order it.
If there's anyone who disagrees with this diagnosis, please speak now or forever hold your peace.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".