2016 ford fusion with: 99d 1.5 l ecoboost engine, 44w 6 speed auto transmission. engine has lost power 3 times while driving within a period of 10 days. engine remains running but will not accelerate and remains in "limp" mode until the car suddenly accelerates. no engine lights displayed. dealer ran diagnostic tests without finding any problem and refused to investigate without a fault code. the next time loss of power happened, i was driving to the dealership to leave the car so they could keep the car and drive it hoping to get it to lose power. they kept the car and drove it a total of almost 100 miles over 3 days without it losing power. dealer still reuses to investigate further without experiencing the problem and getting a fault code. i was told to come back if it happens again. i've been very lucky that when this happens it doesn't result in an accident.