The first efi Rincons would sometimes hang at very high idle, especially at cold temperatures.
IAC would get a thin coating and there was discussion as to if it was cosmoline or from excess air filter oil.
Anyway, spraying it off with carb cleaner generally solves it.
IAC will likely cycle through its range of motion upon key on. Might be able to see if it is sluggish.
06 Rincon 680. Foreman headlight conversion, Guru bumper, Warn XT30, Maier guards, Bighorns
05 Foreman 500 FM, 2.5 Warn, Bighorns
Dually Ram and Patio Hauler 5th wheel