Yeah, it will do it within the first 2 seconds after ignition. When it's cold, I will reach in, left hand on brake pedal, right hand reaching in and hit start button.
Truck surged forward, what seemed like a foot when you're on the outside! It probably was only a rocking back and forth motion.
Truck must load up the transmission, like a power stall, to heat up fluid.
Does it every cold start that it idles up when cold.
A few minutes later it will unload the tranny and idle down a couple of rpm's.