I have a 2001 7.3 with 200K on it. It is lacking power all around. I change the oil regularly and fuel filter everytime I change the oil. The air filter is a K&N and is clean. It gets about 13 to 14mpg. I have had the turbo replaed and the injectors checked by the ford house and my mechanic and both say they are fine. Both say the fuel pressure is more than adequate. I really notice the lack of power between 45 and 60mph when the truck is in overdrive. When I press on the accelerator I cant hear the turbo and the engine feels very restricted and has very little power. I have a travel trailer that weighs about 7000lbs and it is a struggle to pull it down the road. When the tranny shifts you can hear the waste out of the turbo. All of the people that have looked at my truck or driven it feel what I am talking about but cannot figure out where the problem is. I am just tired of putting money into this truck and not having it run right. Does anyone have any ideas????