Lack of Power at Low & Mid-Range RPM

1. Defective ECU.
2. Open or shorted fuel injector circuit.
3. Stuck fuel injector.
4. Defective fuel pump main relay.
5. Poor fuel pump grounding.
6. Incorrect fuel line pressure.
7. Clogged fuel filter.
8. Open or shorted oxygen sensor circuit.
9. Defective oxygen sensor.
10. Open or shorted coolant temperature sensor circuit.
11. Defective coolant temperature sensor.
12. Open or shorted throttle angle sensor circuit.
13. Defective throttle angle sensor.
14. On models lacking mid-range power, proceed as follows:
a. Open or shorted manifold air pressure sensor circuit.
b. Broken or disconnected manifold air pressure sensor hose.
c. Defective manifold air pressure sensor.