I doubt it's speed sensor.
Do a misfire log on measuring blocks to see if 1 cylinder or 1 bank give significantly more misfires the the rest and could be culprit.
Could be lots of things starting with MAF, lambda, dodgy coil pack ... Did you actually check fuel pressure and flow? Maybe fuel pressure regulator is leaking and loosing pressure. What are adaption values like in measuring blocks for fuel trim?
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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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