[Mike_The_Grad]

I have a vacuum leak that is intermittant. It is at the port on the base of the rear of the carburetor. When it's cold it drives great. As it warms up, issues arise. After checking everything I learned that the threaded connection will loosen up as the engine temp rises. And the brake booster hose falls slightly towards the intake manifold and that's when I get a vacuum leak. Troubleshooting is the only way to locate these kind of things. I would heck everything as it is cold and again as it warms up under "normal operating temps and conditions".