1999 Plymouth Breeze Engine dies

I have a 1999 plymouth breeze and after the car has sat for a few hours it will die when driving for the first few miles down the road. If I drive below 30 mph for about 3-4 miles it will not die, but after the 3-4 miles of driving slow it drives fine and I am able to drive it at normal speeds the rest of the time. It does it every time it sits for 2 long. (First thing every day).