My wife and I had a similar problem with our 2020 Limited with just 3200 miles. At freeway speeds the vehicle would start to stall and the engine light would come on. After about one minute it would clear up and drive normal. We took it to the dealership 6 times and continued to get the run around by Ford (shocking). Every time we took the vehicle in, we were told that they could not "replicate" the problem and just gave us back the vehicle and gave us the usual Ford song and dance line, "if it happens again bring it back in". The 4th time I told them I wasn't picking it up until it was fixed. We contacted Ford directly and open a case and a Lemon Law case. Ford just blew us off and the Lemon Law case was rejected. The 5th time at the dealership with the same problem was ugly. After several arguments over the phone, they still said they couldn't find any problems with the vehicle. We contacted Ford again and opened another Lemon Law case and when they dragged their feet, we hired an attorney. Once an attorney was involved, shocking....all of the sudden Ford actually wanted to do some work and figured out what was wrong with the vehicle. Our problem was a fuel injector. Per Ford, "cylinder #1 fuel injector sticks open at times" and "on 3rd road test #1 fuel injector sticking open at times, fuel line pressure drops from 900 PSI to 20 PSI in 10 seconds". Once this was fixed, we didn't have any further problems with that particular issue (this vehicle was at the dealership over 10 times with various other problems). A month or so later Ford called and the Lemon Law case was approved and Ford now has that POS back. Hopefully this helps. We had the same problem you are having at your dealership with Ford not wanting to do any work because they said they would not get reimbursed for parts or labor. The term they used on me was, "we have to be able to justify our cost to Ford". What a joke. Prior to finding the problem, they did what you also did in swapping coil wires and that was not the answer in our case. Then to add insult to injury, because they ****** off so long fixing the car and just giving it back to us when they couldn't "replicate" the problem, the catalytic converter went out less than a week after we got the vehicle back after they finally fix it. Everything was under warranty, but yes....a real pain in the ass and a big waste of time driving to the dealership every week.