Trying to diagnose a loss of power on a 2008 expedition with 180k miles. Driving 70 mpg a week ago and it felt like someone tapped my brakes. Guessing roughly a 15-20% power loss but no CEL. So after reading up I replaced the IMRC and knock sensors while I was in there. No change at all except for a loss of $400. I've done a lot of work to this thing in the last two months. New timing set, oil pump, ford cams and phasers, plugs, cops, fuel filter, etc. Its been running fantastic the last 2500 miles since doing all that work. I don't think its an exhaust restriction. Both cats are the same temp so I dont think one collapsed. I thought for sure the IMRC would take care of it. And I'm still thinking its related to that. Whether it be a fuse to it or a broken wire somewhere. It was just like someone flipped a switch when I was going down the highway. I've been driving it a week and still no CEL so I have no other clues to go by. Considering getting Forscan to do some bidirectional testing but I'm also about ready to send it to a shop. The only other thing I can think of is the previous owner replaced one of the cam sensors with a knock off. Thinking about replacing that just to rule it out. But I also would think that would throw a code. Any help would be greatly appreciated. This thing has run like a scalded dog since doing all the engine work and I'm really frustrated to get it back to 100%.