Seat Ibiza 6L Idle problems and question about throttle flap

Hello guys, I’ve already created a topic a while ago, but it’s now primarily about the idling speed of the vehicle: Seat Ibiza,1,6 16V (105hp) Engine code:BTS, key number: 7593/ACZ. The car always has a different idling speed, if the car stands longer, it turns 1200upm, times 1000, times only 700Upm.. Strange is also, if the car is really warm, I start and only slightly tap the gas, it goes directly from normal idling number (about 700upm) to 1000 high and stays in this idle speed, only after longer driving, this then scrapes off and the car runs a little rough.. Drosselklappe I have tried already 3 pcs., always the same.. As if the DK, respectively the ECU, after each start, the learning values lose, how can that be? It always seems as if he has to grease…. DK was of course learned.. Climate and co. always out, error memory empty.. The question in general: Why does he always spin differently high I am aware that depending on the outside temperature and temperature of the engine/cat, the car goes into the cold running phase, but why always with different speeds, I never had that before.. Exhaust gas values were wonderful at the AU.. Lamda probes and SGD sensor also new.. Leak no to find any that could indicate a side air… Control unit a flaw?? Did anyone ever have that? ? Thank you in advance. Greetings Dominik