Have the IAC checked.... sometimes they manage to gum themselves up. The check engine light can come on if the ECU detects a non-normal idle for a period of time.

1988 Toyota 4Runner V6 5-spd, Toyota E-locker rear end, lock-right front, 3in body lift, 32" BFG All-Terrain Tires, 427,000kms and counting!!! Secret passion for SVT vehicles... shhh.....