Why is there gas leaking out of the exhaust

Hello, fuel control issues - which can allow too much fuel to run through the engine and eventually come through the catalytic converter and exhaust system - are potentially quite damaging, besides not being very efficient. Engine performance concerns cause this - too much air getting into the engine, readings showing too much air when there really isn't, causing a rich running condition -- things of that nature. Either way, hands on testing with diagnostic equipment by a proven technician is needed to figure out what is going on so it can be resolved. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops