I own a 2004 2.7 s type auto ,with apx 84000 miles on the clock. Car has started to `judder a bit `under med /hard acceleration.mainly around the 40 -50 mph range. Also a slight `booming noise` from the rear offside (connected)?. Engine runs smoothly at idle and doesn't seem to be source of judder. Car did get rather wet going through deep floods 10 days or so ago ,wonder if this could be source of problem as I did have to dry out some water from rear of car(not much). (and all electrics working fine since etc). Have used car a bit since and appeared ok. Boot dry. Ideas anyone as to cause?... could it be as simple as a wheel need re-balancing?