OK...It's gone. P0171 IS NO LONGER...!! Changed the fuel pump. Performed smoke test on intake system. After sitting overnight w/o battery, all caps discharged. Car is now state inspected!
I want to thank all of you for your help in chasing this long present (and mildly expensive) ghost.
The smoke test introduces a diagnostic smoke into the system being tested to find the leak: http://www.thesmokemachine.com/homepage.html Check out the FAQs section for more info..