surging
My expedition has about 110,000 miles and sometimes will surge. Sometimes i will be cruising and the rpms will drop about 200-300 and it will start slowing down like i dropped it into second gear. Other times i will be at a red light with my foot just barely on the break and all of a sudden the rpms will rise 300-500 and lurch forward. Does anyone have a diagnosis for this problem? Not even the Ford dealers can figure it out.