At start up when cold the engine revs to 2,000 rpm and then creeps to 3,000 then 4,000 and that's when I shut it off. You're supposed to adjust the idle when the engine is warm. I can't get to that point because it revs too much. It seems to me it's something with the "fast idle" at start up that is supposed to slow down on its own but instead speeds up, as opposed to the baseline idle speed. Anyone got a clue? Thanks!