The past few weeks I've been noticing a whining noise when I let off the gas about the 15 to 26 mph speed. The noise has been slowly getting worse. I'm hoping a tech here can possibly give me some issues that would cause this. I do feel some vibration under the gas petal on the floor board when this occurs. I have to ask here because I'm in Germany and the mechanics here will always say it's supposed to be like that.