Ford Expedition losing power

Check the fuel injection connection to the cylinder #2 for a loose connection or broken wire. A misfire can trip the code P0171 also check or replace the gas cap. or the following and intake air leak could also be the need for a new valve cover gasket. hope this helps P0302 FORD Possible Causes Faulty spark plug 2 Clogged or faulty fuel injector 2 Faulty ignition coil 2 Fuel injector 2 harness is open or shorted Fuel injector 2 circuit poor electrical connection Ignition coil 2 harness is open or shorted Ignition coil 2 circuit poor electrical connection Insufficient cylinder 2 compression Incorrect fuel pressure Intake air leak P0171and p0174 FORD Possible Causes Intake air leaks Faulty front heated oxygen sensor Ignition misfiring Faulty fuel injectors Exhaust gas leaks Incorrect fuel pressure Lack of fuel Faulty Mass Air Flow (MAF) sensor Incorrect Positive Crankcase Ventilation (PCV) hose connection P0442 FORD Possible Causes Missing or loose fuel cap Incorrect fuel filler cap used Fuel filler cap remains open or fails to close Foreign matter caught in fuel filler cap EVAP canister or fuel tank leaks EVAP system hose leaking Fuel tank leaking