I’m at a loose end, please help! S3 8V intermittent rough idle.

wouldnt it be better to switch 3 and 4 injectors around to see if that shifts the problem to cylinder 3 first?

 

It does make sense but have the opportunity to get them checked and cleaned for free so just delving straight in
I was just curious so that if it doesn't solve the probe 100% I know where to look next

 

Fair enough. I'd still switch them round though in case its failing rather than just blocked / dirty

 

will do, thanks again for the advise

 

It turned out to be my n205 bud, sent it into Audi and they replaced it under warranty.