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cruise contrl oscillations, uphill in '91 200tq

In message <Pine.SOL.3.95.970617112936.29298A-100000@ra.nilenet.com> Gideon Weisz writes:

> i've noticed some strange cruise control behavior,
> with my '91 200tq wagon:
> picture going up a long slope, at 2800 rpm, with a boost pressure
> of about .9 and in cruise control.
> i would have expected that this would feel the same as if
> a driver's foot was simply on the gas pedal.
> instead, i get a second and a half of very slight acceleration
> followed by a second and a half of very slight deceleration
> (and during the deceleration an almost inaudible sound as of
> a vacuum leak or an air leak), and this recurs regularly,
> on off on off on off...

Sounds like the wastegate frequency valve is being operated.  

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club