As far as i know there is a potentiometer beside the throttle body, where you can adjust the idle RPM. If you have problems with the idle, i recommed you buy a thottle body cleaner and just spray inside the throttle body while the car is running (car is running, you spray inside the throttle body while reving it). My idle changed alot as i had the same problem and therefore i didnt have to adjust the potentiometer for the idle.
Thats weird i have the same problem on my 2000 V reg k11....the idle seems to not be a constant tick over but more spodmatic. So wich way do we turn the screw?