try cleaning the IAC solenoid first.
Takes about 15 minutes, need to remove the stock air box and have a torx bit handy to remove the solenoid in the rear of the throttle body.
It's either dirty or not functioning correctly.
The AIC allows more/less air in to regulate idle RPMS, and acts as a 'high idle' effect when cold starting during warm up.
The reason you don't have the problem in the summer is because it's warm enough to not require the high idle.
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