Although it's been a topic before, at the risk of redundancy, I'm wondering if I could speed up the process of discovering a vacuum leak(s). Does someone have an idea of the most-to-least common sites to suspect in my search. (1980 300 CD) I checked the pump and have good negative pressure that will hold after shutting engine off (while separating pump from system). I'm tired of having to go under the hood to shut her off.I may even aquire the use of other features as well. I'm down to basics now.