The Idle Speed Control solinoid allows air to bypass the throttle plate in order to maintain idle. It modulates this airflow in order to keep a nice stead idle. Disconnecting it shuts off this air supply, which is why the car should die or at least stunmble if you disconnect it while idling.
Checking the voltage throughout the TPS range would be a good idea. Also check the return springs to make sure somehting's not binding. alos, be certain to disconnect the battery for at least 10 minutes after replacing sensors to clear the Keep Alive Memory that the computer has stored info in. It could take several miles for the computer to figure out a new configuration.
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