Engine Lacks Power/Poor Performance

Check for restricted or incorrectly adjusted throttle cable.
Check thickness or carpets.
Check for faulty ignition system.
Check for faulty fuel injection system.
Check for low fuel level.
Check fuel tank.
Check for contaminated fuel.
Check for plugged fuel filter.
Check for faulty fuel pump.
Check for faulty ventilation system.
Check for faulty emission control system.
Check for valve held open by hydraulic tappets.
Check for high oil pressure.
Check oil pressure relief valve strainer gauze for blockage.
Check for stuck closed oil pressure relief valve.
Check cylinder compression.
Check for faulty head gaskets.
Check for faulty valves.
Check power brake booster vacuum connections.
Check heater/ventilation unit vacuum connections.
Check for binding brakes.
Check for faulty torque converter (A/T).
Check for faulty automatic transmission.