They dink around with your settings in order for it to pass smog, and then they are supposed to put it back to where it runs like a Porsche. From what I gather, our P-cars don't care for it none at all. My advise is pick up a book on Bosch injection systems and fine tune the bits and pieces*. One mechanic that I had to try to smog the thing fried my AMF dinking around trying to get it to pass.
*Disclaimer: all advice contained herein is subject knuckleheadedness, please don't do anything todwic the dumbass sez.