A customer of ours that has a factory non turbo 95-99 Mitsubishi Eclipse had a idle problem with his car. So, he bought one of our manual IAC idle air adjusters to change the amount of vacuum going to the motor.
By using the MPx manual IAC adjuster he was able to get his car to idle correctly with cams and head work.
Link to the youtube video review:
Link to the product with more information and photos.