So I just installed a new Lambda probe, because the previous owner cut the cables for whatever reason.
Taken a new one, I'm at least on the safe side that's safe.
So, test drive, he drives better, but the stand gas is now at 1100 rpm.
This can be related to the empty run controller, which must be cleaned many times.
If anyone knows advice, I'll be grateful.
Oh, when it's warm and warm. he stands so half an hour I also have to noodle more until he starts 
Greetings Thomas
