Don't touch the Idle Screw, leave that alone. I don't know about the IAC on the Montero TB but the computer just needs to adjust itself after driving with the new IAC. I upgraded to the Diamante 6g74 TB and I had the same code, went away with driving the car for a week. The EGR valve on the 6g74 could be bad, I think your 6g72 EGR valve should fit the 74 IM, the nipple on it will just be in a different direction.
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