Im having an acceleration problem with a 1999 e320. I will be driving along no problems, then randomly the accelerator (gas pedal) no longer responds. I have to pull over, turn the car off and let it sit for a few minutes before the accelerator will respond like normal. Sometimes the engine will also die but not every time. Im thinking fuel filter maybe? I get a P0400 code, but I cant imagine the EGR causing this issue. Im completely stuck, thoughts?