My D8 won't start, I have had a bad stumble from day one, use to only be at lower elevation's now have it at higher ele's, got the new update done, seem to help a little on top end, just got back from a trip to McCall ID sled ran good up to the last day when the idle got worse along with the stumble. I tried to start the sled last night, it back fired on the second pull and than tried to start on other pulls, it flashed the lights on the dash a couple times and dose nothing now,I am just looking for answers, has any one else had the same thing happen ?