Installed a regulator, and it gave me control over the mix screw. Still has a dead miss at idle.
Media blasted all my plugs and after about 15mins of running, all but #5 are black as night.
Compression on #5 when cold is showing 130psi, and 65-70psi when hot. Took the valve cover off and checked valves and rods on #5, and they have a full range of motion.