Steering wheel shimmy

[Vbonz@aol.com]

I have been experiencing wheel shimmy for quite some time.  The shimmy is
noticeable when driving at high speeds and when braking.  I have replaced
front rotors and brakes in addition to lower and upper control arm bushings,
but all to no avail.  The car has a 133,000 miles (literally all highway).
The car has original springs, shocks, struts, tie rod ends, etc.  (I have
always been told by mechanic and the Audi dealer that these items were in fine
shape.)   Before I start to systematically replace these items, I am looking
for suggestions as to where to start first.  Any help would be appreciated.  I
also seem to have a difficult time getting precise wheel alignment.

Thanks,

Vince
'90 200tq