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Q: 1991 300e what microprocessor controls the idle air control valve? on 1993 Mercedes-Benz 300E

I replaced the idle air control valve because when the car is warmed up and I come to a full stop at idle with the car in drive, the idle drops too low, below 500 rpms. A mechanic cleaned the electrical plug which plugs into a component that is also connected to the idle control valve and it worked fine for a few days but now the too low idle has returned.? I thought the microprocessor might be bad but I don't know what, where or how much it is.
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