Holley idling issues

Idle off the secondaries with a four corner. square the primaries

If you have a conventional holley drill the primaries.

You can also open up the air bleeds. On the idle circuit. Go one size at a time with a drill bit if you do not have the removable style.

Making the air bleeds larger gives more air so it sucks less fuel. Its like drilling a hole in a straw. The larger the hole the less you get to suck from the bottom of the glass