I just bought a 2000 c230 and somehow there's something weird with the engine whenever I make a stop. It makes a series of jolts. It's nothing that will shock you but it is noticeable. I brought it to an independent mechanic who does german made cars, and he said that there's something wrong with the flex drive. How immediate a concern is that problem? Is there anything else that could be causing that "jolt"? How much would it cost? Thanks