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My B6 has been giving me troubles. Here is what I have done so far:
PCV valve
Ignition coils
Spark plugs
N80 valve
Diverter valve
Replaced a crap ton of rubber vacuum lines

I started with a rough idle, way under powered, drop in mpg's, and had P0455, P0299, P0171, P0100, P0303, p0304. Now I'm down to a P0303. Acceleration is back, MPG's have been better, still has a rough idle on a cold start though. Looking for ideas.
 
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