Has it sat with E10 in the tank?
I don't know where he got gas for it but I am going to assume it was an ethanol blend. I have no idea how long it sat in the tank but it went bad sometime between summer 2021 and January 2022. I let the fuel pump pump out as much as it could and replaced the fuel filter. It will now idle and drive up to about 25mph. After that, it starts fading out. I leave it in gear and once it drops below 25mph it picks back up and starts running again. I am having difficulty getting it timed properly so there may be an issue there. Right now it is timed by ear because it will not run when I attempt to set it via timing light. It has the wire to disconnect to set timing but the computer still keeps moving the mark even though it is unplugged. It has been many years since I worked as a mechanic but I did remember that wire and that it was hidden on some trucks.