Bucking after running for 100miles +
Have 99 f-250 with 7.3 powerstroke with 220k miles. I use it for a regular trip of 200 miles and after 100+miles the truck starts bucking. This usally happens after stop at red light and continues until I get to destination. After I get home from the trip the next day it runs fine after it cools off. The check engine light flashes when this happening. I have had it back to Ford dealer three times. Ford has had replaced the A C sensor asy and dropped the fuel tank to replace sock in tank. After these repairs it is still doing the same thing. Any help would be great.