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If I drive my truck everyday, It will start like it is 80 degrees outside. If it sits a couple of days it gets the romps and pours white smoke. Why does it start better being driven daily?
The only thing I could think of is maybe the HPOP is bleeding off slowly? Maybe take a look at the oil level in it the next time it sits a few days and see where it is as a starting point.
Cold temps cause the batteries to become weak, starting and running the truck daily keeps the batteries in good shape. Might want to check all your connections just to make sure the truck keeps starting.