UPDATE!
I've made progress and it's running again! ;-)
The ECU had a fault and had to be repaired. It was no longer recognizing the engine's flywheel signal. It's a fairly typical problem, according to the expert. He also removed the immobilizer.
Unfortunately, I still have a minor issue.
When it's cold, it runs perfectly now. But when the automatic coldstart swich off and it's only idling at 800 RPM, it suddenly doesn't run smoothly anymore, it's running on only three cylinders or so
What do you think? A sensor? which?
Thanks
