It will do the same thing off of either tank, both of which have no notable debris. I have a new filter with nothing showing up in it. I have not replaced the fuel lines which are original and have some pretty long runs but appear to get very good fuel flow. Honestly have not taken down the carb and cleaned it, not sure if could be some fiber/lint in the mesh somewhere. With all the bad press on the SAMS and coils from the era and the location near/above the exhaust thought heating up and shorting/faulting makes the most sense, just not accustomed to such a investment to rule out ignition. I will focus on the fuel as well.
