Ok, so I have a vacuum leak on the right rear of my intake manifold. I got the bright idea to grab a little bottle of Testor's enamel, and pour it on the gasket, in hope that it will pull a little paint in on the gasket, thus marking the leak, making it obvious when I tear it down. I used purple, thought it would make a good contrast. Well, it sealed the leak!

At least now it's drivable until I can get the new gaskets on.