I have a bit of an issue with my car while it is in drive gear and I am not touching any pedal. While I am waiting at traffic light or stuck in traffic jam my car maintain about 1200-1400 rpms when I release brake and do not touch accelerator. I can even feel how it tries to drive further when i am stopping it. Also it brings rough gear change when changing from second to the first gear during slow down. Also fuel consuption jumped up. This issue pops up only when engine is hot and car was used for at least an hour or so.

Another thing i have noticed is that when car is in parking or neutral and i press accelerator it cuts off revs at 4000 and drops them down to 1500-2000 although throttle is fully pressed.

I thought that it is because of dirty butterflies. I took it to dealershop, cleaned them and re-callibrated them with command, but problem didn't disappear. My car is at dealershop for already 2 days and they do not know what to do as none of computers showing errors. I am a bit desperate.. I tried with 3 different delearshops and car garages and the result is zero. Did anyone faced the same? I would appreaciate any hint on what to look at.