Truck loses power when going up hills and some times at cruiseing speeds

Hello, a loss of power is a drivability concern that requires hands on testing. The fuel, ignition, emissions and air intake system will need to be looked at for proper operation. Additionally, exhaust flow should be unrestricted at all times (an exhaust restriction can cause a power loss concern). Hands on testing with a Ford IDS diagnostic tool (or equivalent) is needed, along with a fuel pressure gauge and digital voltmeter - ohmmeter (DVOM). Good luck!