Hard starting assistance please.

Fuel pressure at the carb reads between 8-12psi. Carb is literally brand new out the box. Once up to temp it runs decent, but it wants to stall in gear even though idle is set too high at idle in neutral
Maybe too much fuel pressure. Is it an electric fuel pump? Is there an external regulator?
Does it start easier if you pump more fuel into it or if you don’t pump it and hold throttle open instead?