I have an OS .46 LA and I've flown it for a few years and lately I have had problems with it surging while in the air and dying after it surges. When it does this, it is almost always when I am flying into a stronger wind and sometimes when I'm in a steep climb. I adjusted the high speed needle but that seemed to make it worse so I put it back to where it was. Also, it seems like there is a lot of engine vibration when under idle up to about half throttle and then at higher throttle it's not as bad. Anyone have an idea of what is going on? Thanks.