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From my experience, I think the significant thing to notice here is that it idles poorly when started if the temp is very cold out and (please confirm this) until it has run for a minute to a few, depending on how cold out, it will stall if you try to give it any throttle.
I have both 1990 and 1991 Regina cars. One of them has acted that way in all of the three winters I have owned it. Always started, but when it was close to or below zero you HAD to wait before driving it. No issues with it when it was above say 15 out at start or after it had warmed up on the cold days.
Last winter I took the whole intake side apart, cleaned it and put in new gaskets, cleaned the throttle body, intake manifold and IAC and swapped the engine temp sensor with one from the JY while I could get at it. Made no difference. Tried changing the fuel pressure regulator too because even though you wouldn't think that could be related, I once had a car that wouldn't start below freezing and somehow that was the culprit. But not this time. Since I had a spare Regina computer, I then swapped that and the problem seemed to be fixed. But now I think the weather just improved.
Last Spring, the fuel pump died on that car and I replaced it with a new one, but this was unrelated to the cold running issue.
This winter, that car started doing exactly the same thing. Even worse, my 1991 started doing it too, though with less of a warmup needed. So, absent it being a Regina virus that has spread, I think I need to focus on the engine management sensors that I haven't changed yet; the MAP sensor and air intake temp sensor. These are Regina only parts too and would explain why I haven't heard of this from Bosch cars. The only other sensor I can think of is the Oxygen sensor and I think those are ignored at startup.
I don't think it's fuel related because I think we are flooded, rather than starved and one or my cars has a new pump and regulator. Besides, does your car do this again if you stop for a 1/2 hour and try to start it again? The engine will stay warm for an hour or more no matter how cold it is out, but a fuel pump sitting at the bottom of 3 to 15 gallons of below zero gasoline is going to go back to zero very quickly.
So for what it's worth, I think that the suggestions to clean your intake and IAC are good and should be done anyway. You mihgt try the fuel pressure regulator too since it is easy to change and the one for Bosch 2.4 works and isn't too epensive and a spare is good to have. Hopefully, those things might fix it. If not though, I would (and I will, when I have time and it's cold enough) look for a MAP sensor and a intake air temp sensor at the junk yard.
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