prolonged high idle - frosty weather

sebring2005

Cold start high idle 1200 rpm for 10 minuits then normalizes to 600. warm start high idle same for 30 seconds then normalizes to 600. Other sebrings idle down in seconds and don't go to to high idle when warm. I.A.T. sensor changed, no help. Computer issue or some other sensor failure ?

Mr_Shiftright

You could check the coolant temperature sensor for correct values and also check for vacuum leaks, especially in the intake manifold.

sebring2005

thanks for the input. dealership hung up on computer issue and appeared uninterested in more sensor changes. something is telling the computer wha