Superb MK3 FL 206 KW Vibration under low rpm load

@SimplySuperb Hello. I have the same engine and also saw that I have a small leak from the oil filter cap. I did a vacuum test. When the car is cold, at idle RPM, the vacuum is very strong, but after 5 minutes, when the RPM goes down, the vacuum is very small. I have read that this is normal for the vacuum. Could you please check if you still have vacuum after you replaced your PCV?