Tried to start my troy bilt TB90BC weed eater, and it won't start. Replaced the spark plug, and checked for spark; have a little, but some. Cleaned out carburetor and put it all together the same way it come apart, but prior to this fuel was flowing out of the muffler after priming and pulling cord when trying to start. Everything was put together the same as it was taken apart, it was running and died before I took it all apart?