Why didnt you ask the guy who checked your car at the "Bilprovningen"?
He would have shown you where the problem were at.
I would take a guess that the problem is a "bussning", or a "bushing" in English.
Take it to a repairshop.
Med ytterst vänliga hälsningar/Lars. Forummoderator
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Melissa: "But they're all following you?"
Rubber Duck: "No, they ain't. I'm just in front." - Convoy.