In the Idle Air write up there are two references to the SPOUT connector for measuring the AM for non mechanical idle:
If you so choose to dial in the airmass and throttle body airflow while custom tuning you must plug in the IAC, TPS, and SPOUT to calculate idle airmass.
... and later:
You must temporarily lock out the ignition timing to get an accurate idle airmass, this can be achieved by either removing the SPOUT CONNECTOR
Given the reference to locking timing at 10*, I am assuming the SPOUT needs to be disconnected, but IAC and TPS would remain. Is that correct?