the IAC location on eclipse gs
http://www.autozone.com/autozone/repairguides/Mitsubishi-Car-1999- 05/Engine-Mechanical-Components/Intake-Manifold-2/_/P- 0996b43f8037eada
Note the site offers a free repair guide for your car. DIY grade similar to Haynes or Chilton paper manuals, there is much better out there.
its on your throttle body
Looking for a Used Eclipse in your area?
CarGurus has 1,192 nationwide Eclipse listings starting at $1,795.
Search Mitsubishi Eclipse Questions
Mitsubishi Eclipse Experts