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sounds to me like you have a bad battery, or a bad IAC motor, its in the back of the throttle body, up against the firewall, underneath the airhat, held in by two torx bolts (sorry, i dont remember the size right now)
+ on the battery replacement..... i have had it where i would turn the key and the starter would click and then when i turn the key again it start right up, RPM revs up and down when going at low speeds, and throwing codes of shift solenoids and gov pressure sensors and all of this went away when i replaced the battery!
also, if my memory serves me right (does not happen often) the torx bolts are t-25 hex.....