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Chevy Uplander 3.9 hesitate when accelerating
In the morning, when i go to pick up my news paper at local convenience store, the van is running rough and hesitate when accelerating.
When i take the van 1 hous later, it will run smoothly and there will be no hesitation and i will be good for the rest of the day.
If i skip the trip to convenience store and the first thing in the morning i do a long trip, let's say 2 hours trip, the van will run rough all the way during those 2 hours.
When the van is running rough it will stay in this state until it's turned off, wait and restarted again.
When the van is running soothly, it will stay in this state until next morning.
While driving, it never happened that the smooth running engine became running rough and the opposite is also true. It never hapenned while driving that the rough running engine became smooth.
I suspect that at engine start up, a parameter is stored and kept in memory until the car is turned off, wait and restarted again.
DTC code P0336 and P1174
Any idea? Leaving in a cold climate in Montreal Quebec aera. Thanks