once engine reaches operating temp, 170-195F, runs smooth with plenty of power.

What is your question?

diagnosis and repairs to date: Replaced ECM throttle body cleaned coolant sensor replaced intake air temp sensor cleaned Idle air control valve replaced and throttle body passage cleaned new fuel filter fuel pressure tested good once engine reaches operating temp, 170-195F, runs smooth with plenty of power. What else would case rough idle, stalling until engine reaches operating temp?????

What makes this problem better or worse?

rough idle until reaches 175-195F operating temp

How long has your 2001 Pontiac Montana had this problem?

since my ministry received car as donation