occasionally when i pull out of a parking lot and go to accelerate onto a frontage road i feel the truck will studder as it shifts from first to second gear.. it feels like 3 of 4 pulses...

it doesn't do it every time, and it seems to be more often when there isnt a great load on it.. if i'm accelerating hard i've never felt it... this started from day one of owning the truck and i have taken it in a couple times complaining about it, and they said that they checked it, drove it, and couldn't find anything...