I don't remember if VW still used the fuel injection system with a movable vane airflow meter in 1990. But if it does, you might check to see that the vane will move very easily. In older VW's the airflow meter was under the air cleaner element.
What might cause the vane to stick? Oil sure could, but I like Dell's idea of icing. Was it really humid and cold? There should be a duct to bring in some exhaust heat when the system is cold, to prevent icing. Once the engine gets heated up, icing SHOULD disappear.
It has been a long time since I messed with VW's....if I remember right, Wolfsburg Edition meant the car had a bit fancier interior and usually air conditioning. Good luck with it!
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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