Ignition oscillator 1.4 T-GDI

Hello, my friend drives an i30 PD with the 1.4 T-GDI and has been complaining for a few days about a jerking while speeding up. I quickly ordered an ELM 327 and yesterday read out the error. Seems to be a detonator in the 3rd cylinder. Spark plugs only recently came in again. I then changed the ignition coils across yesterday, but since then no longer driven, but only started the engine. The error could be deleted, but came again and remained Also in the 3rd cylinder, or do I misinterpret the error message here, because it says: Status: Stands out? What would you control next? Change ignition cables? Thanks in advance for helpful tips.