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well just for kicks I replaced the thermostat this weekend, and it runs the same. high idle for 6-10 min and sluggish, then it runs perfect after that.
I think I'll give up now. lol


it's a safe bet that the extra long fast idle is common but not normal.

the rough running could be another differnt matter

the IAC you got from the junkyard was the same size as yours?


1989 5 door montero 3.0 auto
stock original Japanese
about 200k miles