84 5000S High Rev

[Michael Spiers <mikes@specnet.com>]

Hiya!  On the  84 5000S I gave ot my girlfriend, I'm having a wierd problem.
 Once the car is warmed to running temperature, the thing revs at 2,000 RPM's
consistently.  Revs are around 900 RPM's when first started, and runs normally
until operating temperature is reached.  At first it only did this when it
drove from DC to central PA, so I figured maybe it was an altitude sensor (do
Audi's even have one of these?) but now it seems to do it no matter where the
car is.  Because it only does it when warm, is it possible the start-up valve
is screwed up?  Maybe an O2 sensor out of whack?  Any input would be greatly
appreciated!  BTW, the car has a 2.2, non-turbo, 5spd manual.

-Mike
87 5000CS TQ