Nice that you have the real thing, there are quiet a few steps and needed brass to make them right, Do you have a wideband meter in the system?

Part of getting the idle system right is determining if the throttle plate is covering over the idle ports such that thy start to get uncovered only as you are oping the throttle.
If the throttle plate is open and a progression port is open it will feed fuel before it is supposed to.

With the carb you have, is the primary the outer or inner throat?

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.