Boost problems

[RICHARD MEZIC]

While driving the '91 200q (all-stock) around town this weekend, I noticed
the following problem:

When I "get on it" and the engine develops boost above 1.2 bar, the engine
(and entire car) bucks like a bronco(!).  It can be quite disturbing if you
don't expect it.  And it's tough driving the car and intentionally
accelerating *slowly* :)

I'd suspect vacuum (or actually pressure) leaks somewhere.  I'd think when
the engine is running vacuum (<1.0 bar) it doesn't care if it sucks air in
from the leak or from the airbox.  Once the turbo pressurizes the system,
the air gets pushed out of the leak because it's under positive pressure.

Could this also be related to another problem I've been having recently?
The car is hard to start.  It will take a considerable amount of cranking
for it to initially "catch".  Once it does, it idles fine.  Does not seem to
matter if the engine is cold or hot.  FWIW, once started, the exhaust smells
as if it's running rich.

Any possible causes, or more importantly - solutions?

State inspection is due at the end of this month.  I'm sure my mechanic
would love to charge me for some work...  I'd like to "cut him off at the
pass".

(Another reason to own a quattro - they can't put the car on the NYS dyno
inspection machine because of the AWD.  They can only use the sniffer in the
tailpipe.)

-RJM-
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