First Fault

[skodayouth]

Well, It's only taken 6,000 miles for something to break, aside from the really annoying issue of vibration up my windscreen the car has now developed a problem!

When sitting and idling (In N or D) the revs keep randomly dropping maybe once a day or so, sometimes going as low as 400RPM. Car feels like it is going to stall but picks up at the last second,

I ran a scan with VAG-COM and there's no fault codes on the engine, which is what the dealership will no doubt tell me. Are there anythings I can check that are obvious?

[GlacierNR]

Something similar happens on my 06 Fabia when its in neutral. I read somewhere on here that it might mean a dirty throttle body. (?)