Intermittent problems with engine/transmission hesitation and shifts in speeds lower than 40 mph. problems noticed from time car was purchase to current. dealer has checked the car four times and duplicate the problem. the vehicle changes gears several times when driving at 25 mph. originally the shifting problems lurched,jerked, as if someone was hitting from behind. tsb 00505 was applied on july 28, 2005 by the dealer. it changed the shifting problem so that it isn't a jerk but sounds like a bump from the rear of the vehicle, also caused significant delay when vehicle is at a stop and then accelerated. many instances made me uncomfortable about safety: pulling out when there's a break in traffic, hesitation happens significantly long enough for there not to be a break anymore; coming to four way stop, when its my turn to go, hesitation creates confusion to other drivers. the problem is also distracting when driving in traffic because driver is trying to second guess the vehicle to alter the problem. *jb