I have a 1972 Opel Gt with a solex carb and its causing me troubles. The carb is CHUGGING gas. At the moment my gas tank is pulled out because i have to get the gas tank boiled but i have the line bypassed to a 1 gallon tank. But anyways the carb is chugging gas and when you give it alot of gas at one time it will sound like it will want to die then after about 3-4 seconds it will start to rev up the engine. What are the suggestions do you think its a vaccum leak or it just needs to be adjusted?