Should not be doing it, especially with the manual box.
Had similar behaviour on C4 A6 2.8 years ago. It gradually got worse until it was stalling when switching to neutral and going to a stop at junctions. It turned out to be a combination of sticking idle control valve and a small air leak in the hoses by throttle body
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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