My 1999 C230 Kompressor roars like crazy when I first start it up - to the point of shaking and rattling items in the trunk and causing the floor boards to shake. When moved from park, it leaps into gear, although the idle is not set high. When stopping while in gear it happens all over again. I have to put it in N for a stop light to stop the shaking. It drives smoothly on highway at highway speeds, although quite a bit of engine noise, but is dreadful around town. Anybody have any ideas. My nearest MBZ expert is 100 miles away.