Hi Lennie,
The cold air is likely causing something to contract when it gets that cold or there could be an issue with the engine coolant temperature sensor (ECT). I realize fuel pressure is correct, but if the computer thinks it is warmer than it is, it will lean the fuel mixture.
Just for curiosity, if you clear the code, how long does it take to return in the cold weather?
Also, take a look at the pic below. It is a list of circuits controlled by the ECT.
Here is what I suggest. When the temperature is cold enough for this to happen, check for vacuum leaks.
Here is a link that explains how it's done:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
If you are unable to find any leaks, we need to check if the ECT is equal to or very close to the ambient temperature. That will need to be done when the engine is cold.
Let me know what you find or if you have questions,
Take care,
Joe
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Friday, December 23rd, 2022 AT 5:21 PM