Lack Of Power

Inspect induction system. Inspect for air leaks downstream of throttle valve. Inspect duct between mass airflow sensor and throttle body.
Inspect throttle valve for binding and proper adjustment. Ensure throttle valve opens completely.
NOTE: On Trionic T-7 Engine Management System, perform this test with ignition off for at least 10 seconds, otherwise Limp-Home Solenoid may engage and set DTC.
Verify fuel pump is okay. Check fuel pressure and pressure regulator. Inspect for leaks or restrictions in fuel line. Check fuel filter.
Check injector operation by individually unplugging connectors. Engine RPM should drop noticeably. Check opening duration. Inspect injectors for leaks.
Check Manifold Absolute Pressure (MAP) sensor.
Verify Mass Airflow (MAF) sensor filament is not broken and burn-off function is working (if equipped).
Check turbo system for proper operation.
Check Engine Coolant Temperature (ECT) sensor operation.
Check Intake Air Temperature (IAT) sensor operation.
Ensure electrical harness, connectors and wires are not broken or loose. Check all input signals to ECM.