I have an 04 F250 6.0L Auto with a cruise control issue. It seems to work fine below 65 mph but once I get close to 65 it seems to buck and jerk. Mostly on flat or downhill. When going uphill and accelerating it seems fine but once it starts to lift off the pedal it starts doing it. While driving on the highway there seems to be almost a spot in the pedal that I can make it start to mess up. I thought maybe with 345,000 miles maybe a bad spot in the pedal electronics but I have changed it with aftermarket and Ford pedal assemblies and no luck. The engine has been bullet proofed and I have changed injectors and then a couple minor things as well. I have changed a couple sensors and a couple valves chasing this problem but no luck yet. I work offshore and drive a few states each way so I would like to fix the problem but I am tired of dumping money at a in actuality minor problem. Any thoughts or questions please let me know your ideas.
Thanks