passat 110 auto judder... help pls!
 

Hi, hope someone out there can help me with this........
Just bought a passat 98 auto tdise 110 version, it has a major judder problem most noticable doing 50 mph. Does this intermitantly i think in all gears. Any idea what causes it and how much to fix?? I like the car apart from this problem, is it serious?
Thanks for any help you can give in advance
Steve