2006 Ford F-150

Engine Performance problem
2006 Ford F150 6 cyl Two Wheel Drive Automatic 78,000 miles

I have changed fuel filter yesterday, I can feel the diff. In power, but still misses/hesitates when going up incline. Air cleaner is new. Could it be bad plugs/wires?
June 10, 2010.

Inspect and test all the following listed below: Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note: If it doesn't apply disregard

Jun 10, 2010.