Ok guys, Ive been searching the forum and have tried a couple of your tricks. Here's what it is and what its doing. Its a 2004 f350 with the 6.0 4x4 automatic. I just bought the truck 3 weeks ago and it has perform flawlessly till about last Thursday. I fired it up to go to work, I let it warm up. I took of for work and got out on the highway and it started surging while running down the road, it wont do it at idle. Ive cleaned the egr valve, I checked the turbo vains... and with no luck its still doing it and I dont know where to go with it. Im new to the 6.0 so any input would help thanks.