This is driving me crazy and I need help!! I've got a 96 F350 29,250 miles 7.5L w/ E4OD transmission and when this truck is in overdrive I can feel the engine hesitate or just buck a little. It's almost like driving down a bumpy road but it's just noticeable. If I give her a little gas she'll run like a raped ape on her way to a gas station, but as soon as I let off the gas there's that hesitation again. (I give it just enough gas to keep it in overdrive) I've replaced the plugs, plug wires, rotor and cap recently and it didn't help. The check engine light hasn't come on and there are no codes to be found. I did have the PCM replaced a few months ago, but that was just after I bought the truck and have nothing to compare it to how it drove before. Any suggestions on what the problem might be?