Hi there recently bought 1.8t gti mk4 and starting to have problems with lack of power intermittently,had diagnostics check but only showing barometric sensor fault,it feels very sluggish when it kicks in and almost as if there is a lack of fuel or air going into engine also been backfiring,exhaust is blowing lots when running bad but then all of a sudden it seems to just kick back into normal running,if anybody has any ideas plz cos I'm a vw virgin
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