Ignition Coil Replacement

"I have a 2014 Mitsubishi ASX 2.0 petrol with 232,000 km. A few days ago it suddenly lost power while driving on the highway. Since then it's idling rough, the car shakes slightly at idle, and the exhaust note sounds like an old VW Beetle. The oil level is normal, the spark plugs were replaced about two months ago during the last service, and there is currently no check-engine light."