What causes this ? Kohler 23hp on my Lazer 60" has about 900 hours on it. I have to let it sit and idle to keep it from doing this and still runs sometimes after I kill it. The longer it is ran and the hotter it gets seems to make it worse. I heard some where that kohlers like to be turned off on high idle ? This does not sound right . I think it is referrred to has dieseling. Anyone else have this problem. It does seem to idle a little high.