Diesels do not have a "throttle body." They do have electronic idle regulation and it sounds like yours is not working. Unfortunately, the IP in your car, like mine, is buried under the intake manifold. The problem could be caused by a loose or dirty pin at one of the connections on the IP or by a failure of one of the components in the ELR system. Dealers and shops used to have a plug-in diagnosis box for such things but after 18 years I don't know. About all we as owners can do is to check all of the wiring and connectors.

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970