my car idle wen you hit the gas pedal

You have an electronically actuated throttle. There are a few things that could be wrong including the pedal position sensor at the gas pedal. There's also a throttle actuator at the throttle body. either could have failed or there could be more to it. I recommend you find a Benz specialist and make friends. Get the car diagnosed and he'll give you an estimate or tell you what's wrong if you think you want to fix it yourself. If you want to find a specialist, here's a directory link for you: https://repairpal.com/mercedes-benz-repair-in-philadelphia-pennsylvania

I have the same problem.