Sporadic engine stutters/slips MKB: AEX 44kw/60PS

Hello community, I’m back! Today I have a topic where I thought that there will be nothing there so quickly. The engine. Vehicle data: Ibiza II 6k1 – AEX 1.4i 44kw/60PS with approx. 205tsd. (formerly a driving school car) I have been here if it helps the exhaust gas values lie quite fresh. (Once with hole in the cat and the stock) If it helps I still have my laptop with ODB cable there, maybe you can read something during the ride or so…but for these questions I ask j a euch! The error memory was empty at the last readout. And I do have really sporadic ignition oscillations (in my opinion feels like that). Sometimes, during many rides, nothing happens, sometimes it stutters easily in idle mode. The engine temperature does not seem to play a role. I could observe the whole thing after minutes with warm engine as well as in the morning directly after the start. As soon as the problem occurs, it swallows up quickly. Rarely you have to give gas in the stand because it threatens to drown and otherwise the complete driving behaviour is then very sluggish…it then feels like the twingo of my mother. These dropouts come in the range 1000-2000 revolutions. After that everything is “ok”. My/our suspicion lies precisely with the spark plugs or the ignition cables. Since the candles have already at least 25-30TSD KM down I want to exchange them anyway, but only lacks the torque wrench … the cheap have all 28nm au I don’t want to grill anything. A workshop also fails financially. Enough money gets first. Can you explain this?… Greetings!