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It sound like the most common problem is the Idle air control valve get stuck. So i am going to clean that. I was alos reading that these motors have a idle up mode for the power steering. I am wondering if thats affected by me running a PSC Tc power steering pump for my ram assist. If its not the Iac i am going to try the thermostat and look into the coolant temp sensor.
Are you running the sensor that is on the high pressure ps line? Even so it would not raise the idle that high.
Did you let the engine get to operating temp? If you did my guess is the iac.