Quote Originally Posted by DennyW
Check all your connections, and around your gasket areas for vacuum leaks. A can of choke cleaner works good. Just use little squirts at different points, and watch the gauge, and listen for rpm changes. Don't forget the throttle shaft. It sure sounds like a vacuum leak. Fuel is ok, right ?
Another thing that works well for this is a small propane torch. Turn it on (with no flame obviously) and run it around the gasket areas. When the RPM's change, you've found the leaking area.