I had a similar issue when I ran Smokem's comp DV's, it would surge to the point of the truck feeling like it was bouncing down the road. Cruise control would eliminate it. Only really happened on the highway and I'd hit a small bump in the road and my foot would move slightly on the throttle. I put a set of 181's back in and it went away. Lost a bit of power, but it certainly wasn't worth the headache of not being able o drive it comfortably. I ran those DV's for months without issues, but it was in the winter and I think the winter blend tamed it. As soon as the summer fuel came into circulation is when it started.