Start with checking all the plugs, make sure they are correctly and fully plugged, check for water ingress/corrosion. Check wires for visual damage. Then move to swapping parts between cylinders-spark plugs, coils, injector one at the time and see if cylinder 1 misfire moves to another cylinder together with the part.
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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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