Lack Of Power

Check ignition system.
Check for faulty PCM or ignition grounds.
Check ignition timing.
Check for contaminated fuel.
Check fuel pressure.
Check for restricted fuel filter.
Check EGR system.
Check for restricted air filter.
Check for faulty Throttle Position (TP) Sensor.
Check for faulty MAP sensor.
Check O2 sensor for silicone contamination from fuel or improper RTV sealant.
Check for faulty coolant temperature sensor.
Use scan tester to ensure vehicle speed sensor reading matches actual vehicle speed.
Check A/C system operation.
Check charging system voltage.
Check power steering operation.
Check for faulty automatic transmission/transaxle operation.
Check valve timing.
Check for improper or worn camshaft.
Check engine compression.
Check for restricted exhaust system.