Hi - New to Forum. I have 99 Expedition XLT 4x4 w/ 5.4L. Have been experiencing this issue for several years without figuring it out. I don't drive it much - maybe 3000 miles per year. It is used primarily for trailering. This started when I took a road trip out west w/ trailer. When making sharp and even gradual right turns, I have a loss of engine power, as if it is not getting fuel. This happens most times, so as an example, if I make a right turn, give it gas it goes, but then I lose engine power for a moment (1/2 - 1 sec). Then it recovers and goes as normal. Every time I think I fix it, it still persists. Here is what I have done over the course of the last few years (this is probably not a complete list): 1. Spark plug replacement and Coil pack replacement 2. Replaced fuel pickup/pump 3. Replaced fuel filter 4. Replaced Fuel pressure regulator on engine fuel rail I have checked and rechecked all fuses, wiring connections. I have also checked in wheel wells to see if anything is happening that is causing a restriction or shorted wires = all good. Fuel pressure is good. No codes thrown. No engine light. Electrical power is not affected. I do have an right side exhaust manifold leak - the notorious warped manifold syndrome that most F150/Expeditions experience (this is second manifold that was replaced by dealer 8/9 years ago. Not sure if I am getting air sucked back into the exhaust that is causing this?? I also had a spark plug ejection, that was tapped out and had an insert sleeve installed 4 1/2 years ago.