2010 stalls when started, then runs great

[captcoho]

My 2010 stalls after it's first started, let it idle and will maybe stall a second time, then run great.
Now if the engine is still warm, but has sat for a bit, it will stall at least once even though the temp gauge indicates the engine is still warm. Then again it runs great. This would seem to me to eliminate the temp sensor, or the co sensors. There are no codes or warning lights.
It has to be some sensor, which one and where???

[avguy]

Did this stalling increase gradually over time or all at once, just like it's happening now? Have you tried to stop it from stalling by pushing the revs up right after you start it up? Do you know any who owns a real-time scanner that you could borrow to check some things such as S/T fuel trim as it's stalling out?

[Pooh Man]

When my first O2 sensor went out it would start fine, then stumble n die out. Once it began to reach operating temp it was fine