:embarassed: Hello, i am having the same problem on my N 96 GTI 8 valve,
I have replaced the breather pipe - as it was well worn but still stalling at junctions/
I am not sure if the breather pipe is what you are talking about in your fix, it runs out of the engine block on the front and up to the top of the rocker cover where there is a black box type with two inlets for the hose, then the other end of the hose goes into the main airfilter pipe?
if you have anymore info please could you send it over.
Cheers