Cold very hard/no start 99' XC

[MilehighV70XC]

Car turns over, wants to start like normal, then dies. After the initial attempt, it turn over much slower, tries to start, sputters then dies. Occasionally backfires during this and can smell raw fuel.
If I keep trying to start it, it will stumble then die. I try to start again, stumble and die. When it is stumbling the motor will not respond to any throttle with key in position II. After about 45min I can go back out to start the car, it stumbles really bad and will now responds to throttle. The car starts but stumble at like 500rpm and if I can get RPM's to 2k and hold it there, the motor will miss/stumble then will smooth out after about 10sec. and drive and start just fine the rest of the day.
Next morning might start with slight stumble and clears up holding at 2k rpm or go through the same thing. It is kind of random.


Code I get is a 1132, O2 sensor, all the time. I have had this code for three years now. I replaced front O2 two years ago. Can not find a vacuum leak. Occasionally code 300, but goes away after the stumble goes away.
I am thinking temp sensor. Would this cause the hard start? Will disconnecting temp sensor change anything on start up?

Seems it has been happening since the temps have dropped below freezing. Weird thing is that yesterday is was -22f when I went to start the car in the morning and it started with small stumble but cleared up right away after holding at 2k rpm. This morning -18f would not start. Waited 45min came back out and started. Other day 25f no start.
Disconnected MAF made no difference
I have an inline check valve behind the fuel filter.

Would the very minor breach in the head gasket cause any of this? Another weird thing. Now that is is really cold I am not losing any more coolant. Drove 165mi in the mountains and did not lose a drop. During warm weather I would lose almost the full over flow tank amount on the same trip, weird!

I saw the post by the other Coloradoan with the same problem. Hopefully one of us can figure it out.

[abscate]

Temperature sensor sounds likely , search threads for correct parameters to confirm