Engine Has Lack Of Power

Verify throttle valve opens completely when accelerator pedal is fully applied.
Check for limited airflow sensor plate travel caused by defective screen in airflow sensor plate boot.
Verify air intake system is unrestricted.
Check EGR system for correct operation (if equipped).
Ensure fuel system pressure and volume are correct.
Ensure base timing is correct and that timing advance system is functional.
Check coolant temperature sensor operation.
Check transmission for correct downshift (auto. trans).
Check fuel tank filler tube for tampering of restrictor. If tampering has occurred, check catalytic converter for lead contamination and exhaust system restriction.
Check for use of poor quality fuel containing insufficient cleaning additives. Prolonged use of poor quality fuel can cause injector clogging and carbon build-up on intake system.