Join Date: Dec 2005
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Is the car still under warranty?
If so,put the filter back to standard and take to your dealer.
I must admit,I doubt very much that the filter would be causing this kind of fault,but if the dealer sees the aftermarket one fitted,they will void your warranty for the engine.
Welcome to the forum,by the way.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo