Ok. I've switched to the other carbs to see if it would run with one spark plug cap removed. The carbs I took off wouldn't run on the right with the left plug removed. The other set I put on tonight won't run on the left with the right removed. What exactly should I address with these carbs? Before any one says combine two into one I'm not going to. What should I be looking at? Float level? Idle jets? I've tried adjusting the air screw to no avail. I've attempted a balance but ran out of time.