Holley 1920 Idle issue

Well then, there IS something wrong with this one. Since it's a reman, I recommend you take it back. The other option is of course to figure out what's wrong and fix it. But you paid for a bolt-on, not a fixer-upper...

If you want to fix it;The first thing would be to verify that the float level is correct and that the valve is shutting off as it needs to. Next would be to prove the idle-air bleeds are clear.And then that the idle and transfers are also clear.