Help Help, a cylinder does not ventilate,3.6 switches

Hello
Let's get together again.
I have a huge problem.My V8 3.6 switch BJ.90 had a motor damage and I got a new replacement engine from Audi with proofs (engine identification letter ABX 028) with 35000 km.We then installed it and after a long time we got it to run.The problem is that the seventh cylinder somehow doesn't want to run properly.Zündkerze is always black.I call for a short time what we have already tried;
spark plug replaced with another cylinder-that same problem-again spark plug black on cylinder seven;
All right, well, let's swap the ignition cable that same problem-return cylinder seven--
well, then Ignition amplifiers changed from left to right, but also not, again cylinder seven
Okay,we'll swap the injection nozzles,but we didn't work,but again,seven cylinders.
Compression has been measured, all cylinders have new car values, spark on all cylinders there, now would have only one thought, maybe the distributor, but the Zyndfunke is there, can you help me or do you have tips what else to do?????Even control unit, but as I said, Zündfunke is everywhere.