I have a 23 kohler with about 1300 hrs on it. It runs fine, but when not under load (blades not on) it seems to pulse and run kinda weird. The RPMS quickly drop off and then come back, in about 3-4 second intervals, its almost like it is missing, but it doesnt do it when loaded. I have never noticed this before, is this normal? Also the ile seems to have got really low all by itself.