Just to add to this one. The first thing I would check is the gas cap see if the oring on the cap is weather checked craking etc. Also I had a 2002 with the 3.3L same code and what I found was under the air box you will see the vaccuum lines that come off the canister purge solenoid see if they are cracking split etc. Also follow those lines under the passenger side of the van to the charcoal canister inspect the hose and see if there spliting etc.I found all those hoses split replaced them reset code never came back. Thats really common on those vans. Let me know what you find.
Sunday, January 8th, 2012 AT 11:16 PM