will not pass smog because of lean mixsture fault code

1999 CHEVROLET EXPRESS
150,000 MILES • V8 • 2WD • AUTOMATIC
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STEVEK
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  • 1 POST
hi, i have a 1999 express van that has a lean mixture fault code and will not pass smog because of it,it is a 350 motor
Jan 16, 2011 at 7:51 PM
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RASMATAZ
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  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen Sensor.
Jan 16, 2011 at 11:19 PM