Now it has a rough idle and poor acceleration, and gives engine code 0203. I read more online and saw advice about the wiring, so I inspected all coil connectors and found that the red rubber on the connector for cylinder 3 has a damaged section.
Can this be the cause of the problem?
If so, what phrase should I search for to find a replacement? I am in Sweden and the largest car parts store near me is Biltema.