A few things control idle.
The wax element thermo valve is Mitsus primary fast idle control. That combined with the settings if MS is opening the ISC valve may combine to high idle.

If the timing is advanced it can drive up the idle.
I expect the throttle cable goes slack as it should.
I would not worry about a 2K idle this early in the game, 4K yes.
There is allot to learn still

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.