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That's odd, I thought mine was temperature dependent as well but I've noticed it happen in single digits as well as 50 degree weather. It's completely random as far as I can tell, as long as the truck hasn't been driven in a while (1st thing in the morning or when I get out of work). Also, it usually kicks in 20-30 seconds after the truck is running and continues even when the truck warms up, until I drive it and it shortly goes away. I guess it could be a weak lifter or something. Anyways, good luck and if you find out anything new let me know.
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