I drive an XC60 Sumum since May this year, now about 7tkM. The car is standing one week in the workshop. With constant speed between 1400 and 1500 revolutions the engine is jerking. When accelerating and higher speeds, no problems. No error is displayed, and there is nothing in the fault memory. The injection nozzles have already been changed, without success. Has anyone had such a problem, or heard of it? Without error message the workshop says Inbar in the dark.