I don't recall if Mercedes has a maintenance requirement on the throttle body.

I do believe, however, that the common fix for a sticking throttle is to lubricate the linkage and to clean out the (for lack of a better word) swivel joints.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".