do you have a wideband?

 

Mine does the same thing always @ WOT and always from 2nd to 3rd shift. I've been thinking its the tranny honestly. Kinda feels like bouncing off the top speed limiter.

 

yeah i have wideband tune and i had it retuned already before the problem started

 

my truck did the same thing when I raised the shift rpms but not the mph get with your tuner.

 

Maybe I need to get my tune re-looked at. My first thought was tune, but it hasn't done it the entire time I've had this tune in my truck.

At first only did it when I would do a rolling start and get a good downshift, now its starting to do it also from a dig @ WOT.

Maybe try putting in the factory tune and see what happens.