The First few Times this Season when my Truck went into High Idle, it would come Off it when the IAT Reached 45* like it always has in the Past. But now, it'll just Stay on the High Idle until I Hit the Brake. It won't come Off it any other way. My IAT was all the way in the 60's the other Day while Warming Up, and it was still in High Idle until I Hit the Brake. Any Ideas?