I have no idea. The vehicle has around 65k miles on it and I have never serviced the MAF or PCV. Would it make sense that they would operate differently in different temps? Is the an intake air temp sensor somewhere?EdBwoy wrote: ↑Tue Jan 09, 2018 11:33 pmDo you know the health of the PCV valves?
Also, any idea if you throttle body(s) have been cleaned recently?
I would try that and cleaning the MAF (mass airflow) sensor to see if anything changes.
I have had a problem in the past that was the opposite of yours. Starts well when cold, and would stumble and die when warm. The idle relearn cured that for me.