Hello!
Thanks both for your answers, I have changed many electronic things but the engine behaves in the same way so it's probably not metal debrese, what I have not done is changing the small magnet that sits on the flywheel when it probably assembles from the backside.
I have not checked all the wires (there are a fantastic number of wires), but I will see if the brown one has good contact, I have a new ICM contact I can solder, that old one was looking tired.
It is almost 30 years old and then I do not have to pay road tax for it in Sweden, so I want to keep the car.