Bank 4?, it's not W12, you only have 2 banks on V10. But it does sound like not enough fuel, possibly cylinder 6 or 9 not getting enough fuel so (check, swap, replace those 2 injectors). Or maybe not enough fuel in general ( fuel fiter, pump)
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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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