This Wisconsin engine is in a Bobcat 630 which probably puts it at or about 1975 vintage. It's always run good then couple of years ago it started misbehaving. Started missing that was worst at high throttle. I had carb rebuilt but that was not the remedy. I should mention that this got very little use when running good and possible excessive carbon buildup over the years of low use. Last time I got it running it was running on just two cylinders -- Nos 2 and 4. I pulled the coil and had it tested -- they said it was weak...so I've replaced coil, new plug wires and hot Ngk plugs. I'm getting nice blue spark on all plugs. Now when I get it to fire -- most of the time it seems Number 4. After cranking at length pull the plugs they are dry so fuel not getting to plugs. Pull the carb and the float bowl has gas in it so fuel pump seems to be working. After the carb rebuild and when the engine was still not running well I messed with adjusting the float after which the carb rebuild guy told me I should not have messed with that. I've pulled carb again to bring back for him to recalibrate but before doing so anybody have suggestions. BTW the carb is Zenith 11532C.