The fuelling of my S2 seems to have played up. The car overfuels and stalls so badly that it is undrivable. Got the components of the KE-Jetronic checked from a mate and his pal who is into old VW GTIs and we are nearly 100% sure it has to do with the metering head. Luckily I was able to source a brand new one that also came with the air flow sensor. The problem I now have is that the two new parts are from the S1 and the fuel lines to the fuel regulator doesn't fit. I could now try to get these two fuel lines from an S1 so I can connect the fuel regulator. But somehow I now wonder if there are more differences which can't be seen at first sight and if could run into trouble using the S1 parts?