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2004 C4S Engine running rough when gas tank is near empty

Fuel System

Vehicle Information: Model: C4S; Year: 2004; Body Type: Cabriolet; Total Mileage: 13,000;

It seems when the gas tank is approaching empty and the warning light comes on, the engine seems to run really rough. When full, there is no problem. Do you think that there is some bad gas that is sitting on top of the good gas in the tank that is finally reaching the bottom, when approaching empty? Would the remedy be to just let the tank run really empty and endure the rough engine or should I drain the tank, and if so, how is this done?

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