So my truck has been acting up. When I drive down the interstate (going 70-75mph) I will get a jerking feeling. It only happens about once or twice at a time and will stop. Then a few moments later it does it again. It only happens at cruising speeds, not when I'm accelerating or decelerating. I can feel the jerk below my drivers seat. Ive changed the fuel pump, spark plugs, spark plug wires, and the throttle positron sensor. I took it to my machanic and he couldn't find anything wrong. There are no check engine lights or any codes thrown. Also this doesn't happen all the time. Maybe once ever few hundred miles I'll get a few jerks at a time until I shut my truck off and give it a long break. Then it won't happen the next time I drive.