First try cleaning the throttle-body and ISC per this link:
http://www.4x4wire.com/mitsubishi/tech/throttle_body/
While you have the ISC disconnected, you might as well check its coil resistance per this link:
http://www.stealth316.com/2-isc-iac.htm
Let us know how it runs after doing the above.


90 Montero, 2dr, AT, V6, LSD, AC, KYB shocks, bouncy seat, 182K miles, JDM engine, 87 Starion seats, tow hitch
http://www.geocities.com/idahojack03/Index