Took the truck on a 1000 mile trip this past weekend. The truck surges less under 65mph then it did before. Over 65 at times it surged.

I will say the truck did get good mileage on the trip. I averaged 19.5 mpg hand calculated.

I am not sure what to do next. I know this isn't normal for a turbo to surge.

 

Seems to be worse when there is moisture in the air,