While driving today, my car was "surging," some mild while others were very noticeable. A 'wrench' light came on but when I turned my car back on it was gone. A couple hours later, when driving approximately 40-45 mph, the surging was intermittent & then the 'wrench' light & another light came on after the biggest surge of the day (driving approximately 10-15 mph as I was accelerating once the traffic light turned green.

Cars & Trucks - Ford - Fusion - 2008 Ford Fusion