So it is misfiring at high speed/load. Only thing I can recommend before getting diagnostics cable is to change fuel filter. Cannot promise that it will solve the problem but at it's inexpensive, easy to do and at least will rule it out if does not solve a problem.
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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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