Poor Performance

Check fuel pump.
Check throttle cable adjustment.
Check auxiliary air intake system.
Check airflow sensor lever adjustment and control plunger.
Check throttle potentiometer.
Check fuel system differential and residual pressures.
Check injector fuel pressure and volume.
Check full throttle switch.
Check mass airflow sensor (if equipped).
Check intake air preheating system.
Check catalytic converter.
Check ignition timing.