engine "failure"
Flying a PA 18-150 at full throttle. With absolutely no warning the power cut to idle. Just as if someone had closed the throttle. Was too low (700 ft) to do much checking -changed tanks (both tanks were near full), selected carb heat, made a very brief radio call and landed in a field. Engine was still ticking over when I landed and then I found I had full power available once more. The failure was too sudden and smooth for ice. It was too smooth for vapour lock or fuel starvation. The gascolator was clean. The tank vents were clear. I checked fuel flow it was fine. I stripped the carb -no debris in the filters or in the jets. The trottle cable was sound. The carb floats were a bit out of adjustment but not by much. Any suggestions as to possible cause would be gratefully received.