[s-cars] HELP! Front end wobble

[JR]

My 93 Audi S4 has developed a front end wobble.  Last fall I hit a 
curb.  The wheel had a dent in it, but the car seemed to drive fine.  I 
got the wheel fixed, got new tires, and put the car away for the winter 
without driving it much.  I got it out this spring and upon hitting the 
interstate, I find that it has a wobble.  It only does it at, or above 
75 mph and only when turning left.  Just keeping the car on cruise 
control around a sweeping left curve on the interstate at 75 mph and it 
will start to wobble slightly.  If you accelerate into a left hand curve 
at 75 mph and up, it wobbles hard and fast.  It starts out as a slight 
wobble in the front end, but if you don't make it stop the whole front 
end starts to wobble hard and fast and you'd swear the wheels were 
leaving the ground.  You cannot drive out of it.  If you maintain speed 
during the wobble it gets progressively worse.  If you accelerate during 
the wobble it gets much worse very quickly.  The only way to stop the 
wobble is to decelerate.  Letting off the gas will stop it slowly.  
Braking will stop it right away.  There is no wobble at all going 
straight all the way up to 100 mph.  There is no wobble when curving 
right at 75 mph and up.  Only when taking a left curve at 75 mph and 
up.  I have had the wheels balanced numerous times and had the front 
wheels/tires rotated to the back, with no impact on the wobble.  it 
stays up front.  Any idea where I should start to look?  

Thanks,

JR