I have a 97 Dodge Ram 1500 2wd with the 5.9. The truck has 141000 miles on it. When on the interstate going 60-70 mph I'll be keeping the same speed or going down hill with or without cruise on and in OD it feels like it misses but not all the time. If I give it more throttle it goes clears up. When it started it was only doing it for around 25 miles. Now it will do it for almost a whole trip which is 103 miles one way but not as bad the farther I am along in the trip. I did a tune up of spark plugs, spark plug wires, rotor, and cap a little over 4k miles ago. The truck does have a cold air intake and a throttle body spacer but these have been on for over 12k miles no issue. I think it maybe a TPS or the MAP sensor. I don't have a whole lot of money but need my truck fixed because I need it to help move soon. Please and thanks of the help!