My responsible daughter put some bad gas in her car. It is a 2004 C230 Kompressor,130,000 miles. The car has not had any major problems. She called home for help thinking she had run out of fuel. She said she did not understand as she had just filled up the tank. She went to a gas station that we warned her about not ever buying their gas. The car runs sluggish,sputters , then falls dead. Changed the fuel filter. That's all I did. No improvement. We try to drive it but its very frustrating. This car does not behave like this. Sputtering,putt-putting along. If you press on the gas pedal >20 miles there is a loss of power and it falls dead.Trying to get help or is it in the dealers hand ?