I what appears to be a drain vent in my double basin bathroom sink it appears to be malfuntioning as the water will backup in the unused drain and ythen will bubble and drain properly. Is therre a way to crrect this problem ?

May be a vent issue or just a drain line issue, same fix for now. Remove the trap and have a bowl to catch the cup of drain water. Rod into the horizontal line going into the wall with a 1/4" snake. You will hit a 90 elbow a few inches in but just twist and push your way through. Once the rodding is done then reinstall your trap and pour a bucket of very hot water down the drain. If this doesn't do it for you we may be going to the roof to rod the vent stack.