Just bought a 5KTQ. Need some help...

[Veedub <jewing@sprint.ca>]

I just purchased my first 5000 Quattro.  It's an 86 with all the toys. 
Here's the problem:  It runs like crap.  I pulled the plugs, and they
are pretty black with carbon.  The car sputters when you rev it up, and
has good compression.  The oxy sensor seems to be functioning within the
proper voltage levels too.  Cap/Rotor/wires are all good.  Where should
I start next?  Is there a way to get codes from the computer without
using the dealer diagnostic tool?  

Next problem.  There is a switch below the radio that controls something
with the quattro system.   Sorry to sound really dumb, but I have never
owned or even sat in a quattro before.  What does this thing control? 
it appears to be broken in mine, as it doesn't do anything.  I assume it
controls the differentials?  

Anyone know where I can find a good deal on a Bentley for this things?

Jay
86 5kTQ
82 VW Vanagon
80 VW GTI

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