I just purchased a 88 firebird that didnt run. The gas went bad and caused the car not to start. I replaced the gas and spark plugs and it now runs. It runs pretty ruff. After about 10 mins of it running the carbon canister started poring gas out of the vent. What would cause fuel to come out of the canister line and could it be the reason the car doesnt run right?

bump. Someone must have an idea on whats wrong.