Thanks. I know a "little" about cars but clearly not enough. I use to own a Shelby Cobra replica about 20 some years ago. I could take the carburetor apart blindfolded by the time I sold that car! I should have looked closer at my Duster before posting but I was going by photos I had and not the car (I'm at the beach this week and the car is at home). I actually did google PVC valves before I posted and didn't see the one that is on the back of the drivers side valve cover. I thought that the hose from the carb went to the transmission. At least I've learned something!