Mattsax, your description is very similar too. the funny thing is ..
This morning before the run out to work, I tried the throttle rest..you know, 90 sec and 90sec.. and then the idle..blah!..blah!..blah!
so.. I finish the procedure go for a spin ,, and guess what , It was worst!
So I decide to try again...but in the mean time I realized I was getting late, in the middle of the waiting so stead of waiting the 10 minutes at idle I just drive it like stolen ...and you know what ..Like a dream, dropping the revs at right timing ...
sadly when I hit the traffic queue and of course this lead to ...1st gear, 10 meters, clutch, neutral, stop ....vicious cyrcle!
and suddenly .. revving up again..
So ..after all day at work thinking about it, I realized I did the wrong procedure..I don't know how the he*l I was counting 90 secs as 1 minute..what an id1*t! , I probably did NOTHING! .
Anyway I think i have no choice but to get Alfadiag and a cable so maybe I can spot..."something?"
Or get use to the "Caracther?"...
I'm still searching the forum compiling all the info and simlar experiences as it seems to be kind of random the fixes people is finding to cure this behaviour...