I had been wrestling with a fuel starvation problem for several months over the summer...long story short, the problem was in the right angle/elbow fuel shut-off valve at the top of the fuel tank. It took some doing to get to it and get the hoses off. I had to get at it from underneath...there is just room to get tools up and onto it. Once removed, I found crud on the bottom of the fuel pickup pipe but mainly, found I could not even blow through the valve. Used a toothpick to pry out 23 years of accumulated goop. I thank Craig on Journey for telling me how this was how he solved his similar problem...the engine would run at high idle and crap out when given any more throttle.

If this sounds familiar to your engine woes, give it a try.