1994 Mercedes Benz C280 Rough Idle

When my car first starts it seems fine until it begins to heat up. Once it is warmer, about 60ºC and I am at a stop the engine will drop RPM's a little bit but will shark and the lights on my instrument cluster will dim a bit, like the car is trying to die. I have had the spark plugs, wires and ignition coils replaced recently and just had the oxygen sensor replaced as there were giving off codes for the never ending check engine light. After the O2 sensor was replaced this got much worse, to a point where it is almost constantly doing this shaking and much more violently. I suspect it is either the IAC or MAF sensor but am not sure. A friend also told me it may be as simple as a bad connection in the ignition system somewhere. Any assistance would be deeply appreciated!