I am new to the world of samurai's and I myself just bought an 87' It is showing the same symptoms. It seems to run great when the engine is cold but after running for about a minute it acts as if it is not getting fuel. I replace the fuel filter which was nasty thinking that was it. Then I went for plugs, wires, cap and rotor. I even blew back through the fuel line thinking obstruction. I since then have found that only half of the 2bbl carb seems to working. There is a vac control for the 2bbl and I have bypassed the elect/vac control for the 2bbl and it helps but it still acts as if it is running out of gas under a load. Not sure if it is the carb as I have found them to run upwards of 300 bucks and the sami only cost me a dollar and not sure of how much I want to spend on it. Any help would be great.