i think it points to a vacuum leak..
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Other types of symtoms cause what is known as "Hunting" Which is idle RMP that will not stay correct. The idle goes up to a given range maybe even to 2,200 rpm and then will drop to 600 RPM and go right back up as if a demon has the grips.. Or the bike might go to 2,200 RPM and stall forcing youi to restart.