600 edelbrock secondary bog.

I bought the carb used. But its supposedly new and I have checked the float levels twice. They are spot on. Just tweaked the hanging measurement a hair. The accelerator pump works good. Strong squirt when you move the throttle. I unhooked the secondaries last night to see if the primaries worked good and it ran great then. No flat spot or hesitation at all. It's just the when the secondary circuit opens up. I have played with the metering rods a little bit but I thought that they are just for the controlling the main circuit not the secondaries.