[Steeveedee]

A couple of thoughts. If it starts skipping after warmup, that can be lean mixture. If it is doing it at idle, try closing the choke plate a little bit and see if that changes anything. Also, #1 and #4 cylinder usually get their air/fuel mixture from the same carburetor port. #6 and #8 do, as well. Maybe look at the plugs on these four plugs Vs what the other four look like. It's rare, but I've seen parts loose in the float bowl (a venturi cluster splash shield had fallen off) and half the cylinders running leaner. They won't always exhibit the same amount of misfire, either. Changing the idle mixture screws may not make a difference in this case.