Moin. I was at VW and had it told me that the potentiometer of the AGR valve was over. So new ordered and built in. Since then the lupo has been mucking at lower speeds (under 2000). I had similar jerking (as if he wanted to accept the gasoline, but always swallows itself) , already once – here was the cleaning of the throttle valve recommended to me and voila, that was the solution. This time the throttle valve is however clean and the problem exactly when I changed the AGR valve. The valve is not original, but from a spare parts supplier. Does any of you have an idea ? Thanks and grüetzi