Skoda Superb rough idle and power loss

Considering the symptoms you describe, a defective injection nozzle is a plausible diagnosis. Poor starting, increased fuel consumption, reduced engine power, uneven idling, and stalling are all consistent with fuel delivery issues. Has the engine management system logged any misfire events or emission control faults? Precise diagnostic information would be beneficial in assessing the root cause. What type of gasoline are you using?

Interesting point about the gasoline type I always use the standard 95 octane. Could that really be the cause of the clogging? And regarding the engine management system, is there any way to check for these logged events myself, or do I need special equipment?

Using standard 95 octane gasoline should not inherently cause injector clogging, although the quality of gasoline can vary between suppliers, and some may contain more impurities than others. Regarding the engine management system, accessing logged fault codes generally requires diagnostic equipment compatible with the vehicle's OBD-II port. While some basic OBD-II readers are available for purchase, a professional scan tool offers more comprehensive diagnostic capabilities. Given the symptoms and the potential for further engine damage, I recommend consulting a qualified technician for proper diagnosis and repair.

You were spot on I took my 2014 Skoda Superb to a mechanic. It turns out the injection nozzles were indeed clogged. They cleaned them, but one was too far gone. I ended up replacing it. It cost me 515€, but the car runs like new again. It starts instantly, idles smooth, and the power is back. Thanks a bunch for your help!