'93 90CS steering wheel shake

[Adam Recktenwald <audi@lucideas.com>]

Hello All,

I really annoying problem has just begun with my '93 90 so I wondered if
anyone else has experienced this. When I'm driving at low speeds (20-30
mph) the steering wheel will start to turn back and fourth about 1-2
inches.  As I increase speed, the steering wheel travel will shorten but
become more frequent with a slight shake developing.  My first impression
was a wheel balance/alignment problem but the car doesn't really "shake"
like tire balance problems that I've experienced before or does it tug to a
particular direction like alignment problems that I've experienced.  Then I
started thinking maybe a warped rotor.  I've never dealt with a warped
rotor so I did some digging in the archives and found that a common symptom
is the break petal thumping or throbbing while increasing break pressure,
but I don't really experience this either.  I did some crawling around
while changing the oil last weekend and noticed that both inner CV boots
are in bad shape. (anyone ever replaced these BTW?  How
difficult/expensive?)  Other than that, everything "looks" good.    

Anyone had this problem before?  I greatly appreciate any and all help.

Thanks,
Adam
1993 90CS