97 1500 5.0L. When I am going between 40mph and 45mph in 4th gear and the RPM's are at there lowest, I get a weird hesitation/jerk/stumble/hickup or whatever you want to call it. I am not sure if it is a misfire or not. Other then that it feels pretty decent and idles fine. It seems too do it when I am staying a constant speed within this mph range. Anyone have a clue what this could be? Plugs and wires are only about a year old.