Just got an Audi A6 1999 2.8 quartto,but notice that while driving on an uneven or rocky roadi hear and feel anoise coming from the front side (drivers side) wheel,it sound as if a rubber or something is not there or loose,i dont understand it,a mechanic i asked to look at it is suggesting changing the engine seat or something like that,and that both side have to be changed,anybody with this kind of problem?Any ideas on what this could be????