Driving to lunch last Friday and my engine commenced to running on only two cylinders. Assuming that it was plugged idle jets; I limped on home...as I was close by. Strange thing was that I had a very high idle.
Upon inspection it was obvious that the carburetor linkage had come loose on the left side. I could move the arm on the hex bar with one finger. It had moved over a couple of inches and would not allow the left carb to open. The arms are drilled and tapped for two set screws but mine only had one screw each. Problem remedied.
Ya'll check your screws