I didn't read the entire thread about the surging problem...just enough to figure out it is the 320 that you are having problems with.
In case it hasn't been mentioned...Is the harness in good shape?

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D