My 86 CJ7 with a 258 will go through a gallon of gas in around 3 minutes while idling. It's been a long process to get it to even start again, and now that it does it goes through gas like crazy. Is this an expensive fix? I do have a carb rebuild kit (2 barrel Carter)on the way for it as I know it needs that. What else could it be? Any help would be greatly appreciated.