What's up everyone, I'm been having this problem for a week now and I can't seem to figure it out? I have a 350 tbi with the nv3500 4x4 and it's been giving me problems in first and second gear when I try to accelerate off the light.. the truck will move just fine but once I start picking up rpm the truck surges down in power as if I'm down shifting.. the problem only happens in first and second gear once I shift into third and up everything is fine