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I know its not an Audi, but under the hood its identical to my 4ks.
This is my sons car, and we just dont know whats going on. It
doesn't like to start, but if you disconnect the fuel pressure
differential regulator (?) on the drivers side of the fuel
distributor, it will start right up. However it runs like $(&*). If
you give it any gas it start to bog down and flood itself out, and
you can smell raw fuel in the exhaust. Reconnecting the pressure
differential regulator has no effect. However if you disconnect the
potentiometer (?) on the passenger side of the fuel distributor the
car runs fine, smooth as silk right up to redline. Connect it again
and the problem is back.