Pull the valve cover and check the clearance gap on the valves. I think you find the gap is way too narrow, and when the engine gets warmed up, the gap goes away altogether, and then the valves can no longer close completely, which will result in erratic running and loss of power. The book calls for 0.017" clearance gap with the engine hot, but if you set 'em at 0.020" cold, you will be in the ball park.
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