Octavia vRS 2.0T FSI rough cold idle

[Anowak]

Hi People, Hopefully someone can advise.
Having a cold idle issue with my mk2 vRS 2.0T FSI.
When starting it in under 5*C temps it shoots up as normal but when the revs drop back down it stops at 1000RPM and starts to fluctuate the Revs and misfire on all cylinders (Primarily no.4), as if it cant find where to idle. Sometimes dropping to 600 ish then going back to 850 ish. If I use the accelerator I cant hold it still as the car drops back down then shoots up to where my foot wants the RPM to be. Occurs for about 2min then its fine. Drives perfect other than that, power delivery is perfect. The misfires shake the whole car. If above 1000RPM using the pedal it barely misfires and just fluctuates. New sparks, PCV, Timing done in the past and MAF. I've got 2 codes when this occurs, no lights on dash.
p0519
p0069
Also had a P0299 for a while but I believe this may be unrelated as they don't correlate when they pop up.
I've got a feeling this could be the car asking for a carbon clean but I'm not completely sure. Hopefully will be in the garage soon but for now anyone got any ideas?
Thanks!!

[brown_d9]

Sounds very much like when the PCV valve failed on mine, and I have had one fail a month or so after fitting so could be worth a try.

 

Other than that my next guess would have been a carbon clean, just done mine and it has smoothened up alot.