rough in gear idle and off idle stumble

The carb screws that hols the body to the baseplate are notorious for working loose. If you grab the carburetor and can twist it back and forth seperate from the baseplate, you may have a vacuum leak there. Dan is right about the valve adjustment. It needs to be hot, OR you can subtract about .002" - .003" from the valve lash if adjusting cold and get it spot on.