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It has been some time since the original post. I'm glad to hear the car is running well again.
I'm not sure why the car has repaired itself. The brake clean check may have cleared something up or possibly you moved something back into position. Sometimes cars can be mysterious. The colder weather could have possibly influenced it to work correctly.
Anyhow, I don't know if you are interested in paying for the advice (not a must, but certainly welcomed). If so, just reply so I can set the account to accept payment.
Have a good holiday season.
That could very well be the case based on the symptoms and the fact it came and went without any real adjustments.
Using top tier fuel (fuel stations like shell, chevron, phillips 66) will help keep deposits down and will prevent the carbon build up which could have caused the issue in the first place.