[RIP]

The Idle Air Control (IAC) valve is self desciptive. It's located on the throttle body. Sounds like in your case the valve is stuck open. It either needs to be cleaned or replaced. http://www.autozone.com/az/cds/en_us...rInfoPages.htm Click the images to blow them up. Are you seeing a service engine light?

Are the door locks dead from both the key fob and the switches on the door? If yes, check the two fuses, one on the junction block under the dash and another in the Power Distribution Center (PDC) next to the battery. This could be a Body Control Module (BCM) issue so try pulling the IOD fuse in the PDC for a minute or so. This will reset the BCM. This will only help if the door locks failed after the battery was changed. Disconnecting the battery also resets the BCM.