So it's been this way for a while, but recently seems to have become more noticable. I live off the freeway, so in the morning on my way to work, I am accelerating up the freeway on ramp, usually mildly, and it's like I hit dead spots in acceleration,  adding more go pedal will accelerate, but unless I romp into it more aggressively,  I'll hit those dead spots until I'm up to speed. Now I notice it even If the truck is warm and on flat ground from light to light.    Other thing that ma