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Fuel filter, spark plugs & wires, worn distributor cap & rotor, dirty MAF sensor & throttle body, dirty fuel injectors or EGR valve, lazy O2 senors, plugged cat converter, or bent closed/restricted exhaust system, big tires, low tire air pressure, wrong viscosity lubricants, poor quality fuel, or wrong octane fuel, lugging around unnecessary weight are a few things that come to mind.
I see you have already replaced some good suspects.
Maybe just bring this puppy up to date on due, past & present scheduled maintenance items.
Your owners manual, or scheduled maintenance book would likely list them all.
Yeah, doesn't narrow it down much. For the record, the plugged cat is usually caused by other problems that rob power, such as leaking injectors, faulty O2 sensors, or fouled plugs. So don't jump to the conclusion of a clogged cat unless the other factors have been investigated.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.