RPM dipping below idle when disengaging clutch

[Erikn89nl]

As above, my FWD A3 (AGU engine) is having an annoying issue: when I disengage the clutch, revs drop steadily, then dip below idle to about 5-600rpm, causing the engine to run rough for a split second, before bouncing back up to idle, dipping to around 700, and then back up to idle, where it stays.

Only happens when the engine is warm, it never dips under cold start idle rpm.

Any help would be much appreciated.

 

[Nilz]

Have you checked for any split pipes or done a scan on the car at all, I would do that first and see where that gets you.