When you first got it, you had trouble with the throttle cable, did you ever adjust the idle screw? Or, were you able to fix the poblem without messing with idle screw?
*Check to make sure the gray choke lever is pushed all the way down....push down firmly.
Did you mess with either of the fuel lines?
I once had a veeery small tear in the fuel line, where it attaches to the carb inlet barb, had the same symptoms until I replaced with new Tygon line.
Also, I always use ethanol free gas. That wouldn't be causing your problem today, but you might want to switch once you get it running again.