If you'll look through the Air Mass sensor housing, down into the throttle body opening, you might be surprised to notice a "build up" of residue. You can remove the air mass sensor housing and clean the interior of the throttle body. The build up can keep the flap from opening and closing properly. You can use an engine carburetor cleaner and a plastic scouring pad. Don’t overdue the spraying of the carburetor cleaner.

Hopefully if your problem is the related to the throttle body, you don’t have to spend 1200 for a new replacement part!

As always ... try the least expensive 1st...

__________________
Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML