One less-messy way to find a vacuum leak is to use a propane or acetyline torch. Just turn the fuel on, but don't light the torch. Pass the tip around the suspected leak areas, and when the fuel gets sucked into the leak, the engine speed will change. No messy liquids to clean up, and propane doesn't dissolve paint like carb cleaner.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!