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 - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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