Hi all, I just got my truck out and about again after our prolonged winter here in Michigan, and I ran into an issue on the highway. Let me tell you the story to hopefully answer as many detail questions as I can. First I had to run an errand, so I started the truck on this balmy, 68 degree day and drove down main street (Woodward) about 4 miles in steadily moving traffic to my destination and parked the old girl. No issues. I've got a temp gauge in either head, and both looked good. Left there and headed to work, about 15 miles away, mostly interstate. I've got a 3.54 gear in my Columbia and so can maintain 70 pretty easy, and while passing a tractor-trailer I started to lose power. Stereotypical 'lost fuel pressure' type of bucking, and I was slowing pretty fast, so pulled off the highway, luckily there was an exit, and shifted out of OD and let it coast for a second while I listened to make sure it wasn't running. It wasn't. So I put it in 3rd and tried to start it that way, and what do you know, off she went! Ran fine like that for a while on the service road, so I got back on the highway to see if I could replicate it. Sure enough, it started bucking again after a little while running 70/75. I was able to finesse the go-pedal enough that it didn't stall, but it continued to buck lightly for a bit until it smoothed out and got me to work fine, no other issues. Thoughts? Other pertinent info: mechanical fuel pump, 94 carb (rebuilt), new fuel lines all the way back, and a new fuel tank. Checked all temps when I got out with a laser thermometer and nothing was over 210 (which was right on the heads, 190 on the outlet hose). The carb baseplate was a bit high to me at 160, but the bowl and throttle body were well below that, about 130.