Blackwater 8/18/2010These are the things you have to check
PCM software needs to be updated
Vacuum leaks (Intake Manifold Gaskets, vacuum hoses, PCV hoses, etc.)
Mass Airflow Sensor (MAF)
Plugged Fuel Filter or weak Fuel Pump
Plugged or dirty Fuel Injectors
HouseCallAuto 8/18/20101. Run water over the top of the engine, checking for RPM response.
2. Check for intake vacuum leaks if RPM changes.
3. If OK, check the Positive Crankcase Ventilation (PCV) valve and o-ring for a leak.
4. Remove the Manifold Absolute Pressure (MAP) sensor and the PCV valve.
5. Block the intake manifold cavity with a rag.
6. Connect a vacuum gauge to the dipstick tube.
7. Check for crankcase vacuum with the engine running.
8. Replace the lower intake manifold gaskets if vacuum is detected in the crankcase.
9. Clean the Mass Air Flow (MAF) sensor elements with a Q-tip and contact cleaner.