Lack of Power/Sluggish/Spongy/Stumble

1. Check for plugged air filter and replace as needed.
2. Check for air leaks between manifold and throttle body.
3. Check Ignition timing and ensure ignition system components are satisfactory.
4. Check fuel filter and replace as needed. Perform fuel system pressure check as outlined.
5. Inspect ECM power grounds and repair as needed.
6. Check EGR system for condition causing valve to remain open or partly open at all times.
7. Inspect exhaust system for restrictions.
8. Ensure charging system output is within specifications.
9. Inspect engine for loss of compression, improper valve timing and/or worn camshaft.