No matter what carb you have, basic instinct tells me to look for a vacuum leak.
I would like to recommend you post this question in the Vintage section as well. Lots of folks who like to torture themselves with carbs there.

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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