Roost, I havent run the MSD setup yet, but MSD does not require a ballast resistor with a 6A box, so that will be deleted once I install my MSD components. I dont have tank vents, that I know of. Would corrosion in the tank cause this problem ? I think it would cause it at all speeds temps and conditions, but that is not the case, although I will not say there is no corrosion in there, but if that was causing any problems right now, it would cause them all the time, not only when its hot. I have 2 fuel filters, a big water seperating after the pump and a clear inline filter before the carb and in the clear filter, there is no setiment or crud of any kind. I still want to say electric, and its unfortunate that I am hunting with my wallet but at least I have all new parts on a motor that is older than I am, that and I'm rich bitch !!!