You need to pull any trouble codes that may be stored in the PCM. Now that you pulled the IAT sensor wire with the carr on, your sure to have the "check engine" or
"service engine" or whatever you want the call it, ON. If the light is not on, you might have a burned bulb, do you see the light on when you turn the ignition "ON" before you start the car? You stated that the light was not on in you fisrt post which will initially think me to believe possible bulb malfunction with the engine light.