I have a 90 Mazda B2200 Automatic with carb, I shuts off on highway about 60-60mph. i have to either pull over and turn back on or put in neutral and it will start right back up. I have changed fuel pump, plugs, distributor cap, rotor, air filter and cleaned carbs. Any help is appreciated. Thanks!

 

These trucks have a track record of rust in the fuel tank, which then clogs the fuel filter.