New member, first post. I picked up a 93 F250 that's been in Massachusetts all its life, luckily the owner soaked it with a mixture of linseed oil, motor oil, and mineral spirits each year, its rust free which is like a unicorn around here. When I got it both tanks were full, it was running off the rear tank, I switched to the front just to make sure it worked, then switched back to the rear with no issues. I put Howes in both tanks, set the timing with a light and the power this has surprises me. When I switch to the front tank it will occasionally start bucking and /or increase RPM, it also doesn't like to start off the front tank, I swap to the rear and after a few miles its happy again. I haven't seen any water or contaminates in the filter. Im guessing its bad fuel or the line is sucking air. Not sure where to start.