Hmmm, I have felt something like this but more of a situation and not as long a duration. When cresting a hill and depressing the brake peddle kicks in the tranny "drag", on the downside with truck in tow haul mode it can rev pretty heavy. Attempting to sink back into the accelerator there is a "catch up race condition" that occurs trying to gain rpm to match the momentum from rolling downhill....this your situation?
Oh, by the way....welcome to the forum!
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