Alright I'm bring this post back up. I'm having the same problem too. Just started yesterday with the nosie after hitting the gas to get around a car. The noise does go away after you start to accelerate. My mkv only has 35K on it. My check engine light also came on. I was able to get two codes from it P0171 and P0507.
P0171 means System is too lean : Low fuel pressure or volume, faulty Ho2 sensor, Large vacuum leak, or faulty MAF sensor.
P0507 means Idle control system RPM higher than expected: Large vacuum leak, throttle linkage concern, faulty IAC valve or TPS signal faulty