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It could be the mass air flow meter located inside of the air intake system. Its a faily large black (usually) sensor that will usually cause the check engine light to appear. It cost about $200 plus from VW with $87/hour charge or you can get one aftermarket for about $70 and install it yourself. Sometimes they go bad because of a bunch of grim taken in by the intake or if the intake went too long without being changed. I would suggest getting a new filter and (air) spray cleaning the meter first before buying one.
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