My 2009 Ford F250 SuperDuty Crew Cab 5.4l v8 truck is displaying the wrench warning and check engine symbols, 3 times in 2 months. Goes into some safe mode where extremem loss of power occurs and engine runs rough. Each time towed to dealer, codes read by service, 1st trip replaced intake, second trip replaced throttle body and sensor, this trip the mechanic reset the codes and the truck runs fine. Dealer admits there is something wrong with truck but does not know what to fix. Any suggestions? They have a flight recorder hooked to the truck and are driving it trying to get the truck to code out again. Truck has been there for 1 week this trip, 3 weeks secon trip, and 3 days 1st trip. They want to send the truck home with me on Friday with flight recorder attached and no repairs performed.