stihl fs 55 weed eater issues running . . . what I've done thus far - replaced muffler ,it was very carboned up , compression is 120 lbs no leak down . . replaced carb and fuel line .. new spark plug .. now won't idle .. will run on choke for a couple seconds .. won't run off choke .. have tried to adjust new carb 1 1/2 out on both screws ... no good this thing has me totally baffled ... need some major help Please !