Check out my response from a previous thread.....
http://www.zilvia.net/f/showthread.p...highlight=smog
Put your ECU into Diagnostic Mode & check for any trouble codes. Make sure your Engine Coolant Temperature sensor is working along with your Oxygen sensor. Also check the small vacuum line under the BPT valve. It's "L" shaped and usually cracks causing a loss of vacuum to the EGR valve.
Hope it helps...
ID
EDIT:
Damn CARB!!!...they went & changed the link on me!!!....this is the CORRECT CARB link....
http://www.bar.ca.gov/80_BARResource..._Glossary.html