i have a 2003 buick rendezvous and it died on me and want start up?

[glenn d]

i got it to start up one time and drove it about a mile and it cut off and want start my obd2 scanner read a code of PO449 and the auto parts store said the code was purge soleniod and i changed it and my igntion moudel went bad and i changed it and it still want crank what could be wrong w