It sounds like Ford either has no resolve for this or does not intend to have one. I have a '19 Sport with under 5K that has EXACTLY the same issue. The dealer has driven it, acknowledges the problem exists, and I currently have a "flight recorder" installed on the vehicle to capture data at the time of the event. The dealership claims to have never heard of this problem. They also claim to have contacted Fords tech help, who also "have no idea", since as others have posted, there are no stored fault codes. The symptoms/conditions are the same as in other posts. 1) Run vehicle to temp. 2) Park vehicle 10 to 20 minutes. 3) Start, JUST barely feather the accelerator, as in easing out of a parking space. VOILA! surge ranging from barely noticeable to multiple head-slaps against the head rest. This only occurs ONCE, then the entire sequence must be repeated. As this platform/power-train is now extinct with the intro of the 2020 series, I don't suspect Mr. Hacket's Ford will have much interest in resolving our problem. Note the problem is ONLY with the Turbo 3.5 and not the Natural Aspirated 3.5. My 2013 3.5 Natural Aspirated 3.5 was devoid of this issue. I am a master marine engine tech with 48 years full time experience under my belt, including building both turbo and blown race engines. My speculation is an oscillating pressure surge between the turbo's which are mounted almost beneath the engine and the throttle body, which are separated by a VERY long distance . I don't suspect Ford will have much interest in a re-design of the induction system to cure this. I just wish some parties wouldn't play the "we've never heard of this before" game.