Whats the name of the computer that control the idle speed so that when you have the steering turn to right most, or left most, it will adjust the idleing higher so the car will not stall.

The car in concern is a W140 92 model. When I have it fully turned, the car just dies. My mechanic said the computer (described above) needs replacement.

A part number and the part name will be nice.

Thanks

anyone??