Hello, Where would be a good place to start tracking down a vacuum leak on these 78 1000s? I know i have one (which i believe is causing my strange idle issue) but i cant really seem to get consistent results when i spray around the carbs with carb cleaner. Im thinking its coming from around the number 4 carb. When i got home from work today before i shut it off i sprayed around the number 4 carb and the idle did change, not a lot but definitely noticeable. Its driving me crazy!