[s-cars] shutdown issues?

[Karl Stone]

I'm having a problem with my 93 S4 under heavy acceleration.  It is 
completley stock chipwise and such.  Occasionally when I'm heavy on the gas 
and really feel the turbo kicking in there will be a instant clunky feeling 
and complete loss of power, whipping your head forward.  It almost feels 
like a limiter or something in the electronics shutting it down.  If I get 
off the gas and right back on it everything is fine.  It is definitely 
occurring when the car is producing as much power as it is capable of and 
really ruins the adrenaline rush!  It has happened in several different 
gears, 3rd and 4th commonly and happens at different RPM's, 4k is common for 
the shutdown.  Any ideas on what may be causing it?
On a different and simpler note, are the 15" stock BBS mesh wheels from a 
1990 200 TQ compatible with the URS4?  Any help is appreciated.
Karl

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