Well installed barrow power pack, i have spark started fine, then started missing like it was flooding out, also would not rev up like it was, flooding out. Well checked carbs, clean as a whistle and floats looked fine, also cleaned fuel pump it also looked fine, put all back on motor pumped up gas bulb, started same thing again. Well then just was tired of working on it so i unplugged fuel line to let carbs run empty, after few seconds it started running fine and would even idle correctly and idle up at least untill it ran dry of gas. Did this a couple of times with same results, any suggestion on this problem?