idle control air valve? do I have it in a W210

Hi, I have a 96 E230 4 cylinder 2.3 I think it is similar to an older C-class with a 4 cylinder engine.

Does my car have this valve? I read that cleaning this part would improve idling and possible cause stalling of enginethey when it is very dirty.

Where is this part located?

If ever there is none, what can I do or clean to make the car run better. My car stalls once in a while and has an erratic idle.

Thanks