i have the Purge Valve for the emissions can for $50.00 plus shipping would you like a picture of it to confirm that it is the correct one? send me your email address so i can send you a picture.....Dave
If its that valve on top of the recirc can.. its the same on all GM cars latter 80's. Junkyards are full of them. Its an emmissions part.
Usually the check valve going to it goes bad and the valve leaks. Check that one way valve before replaceing it. And it snaps on to the top ofthe tank.