Always had this, the rev needle seems to bounce up and down, not by much, only 100/150rpm in either direction at the most, but i realised it only does it when the car is hot/ up to operating temperature, when its cold it fires up and ticks over at 1100ish rpm perfectly, i was first lead to think vacuum leak, but then i thought surely if it was a vacuum leak then it would do it when cold aswell? Last time i scanned it, it was code free, and that was just a couple days ago, nothing has changed since. I do plan to do a boost leak test at some point soon. So in summary the hot idle, bounces up and down a bit, and is generally a bit high, between 900 and 1100. PCV has all been deleted and there are no leaks i can find with my eyes. Throttle body is also clean, even polished it with the dremel lol (saddo) and i have done many throttle body alignments. The car is well serviced and is only run on VPower.