I bought an A8 3.7 s-line bj95 240tkm mbk:aew
Unfortunately it doesn't really run....cylinder 5.6 and 2 do not ignite

Have already changed the candles, tested injection nozzles and changed the ignition elements back and forth...no result

In addition, the light mesh seems flat to me because it only runs on foreign current or full battery! ?
Can't get a spark on the cylinders but... do you have a tip for me???
Thank you.