Like I said a couple of posts up, High rev trouble seems to have disappear since I dissassembled carbs, did some cleaning, put em back in place carefully.... Maybe it was just some air going through a misplaced/loose component, I dont know actually. But I fired it and I was done with the rev problem.
Now the engine still dies on itself... I let it sit on idle and plug keeps fouling on left cylinder. Like Larry's Shee said, it could be the choke plunger o-ring being worn/cracked which could cause a gas leak, just enough to make it run too rich on one side... It sounds pretty plausible cause I noticed that my plunger isn't smooth a all when I try to pull it out or in....
Also, I think that my idle screws aren't long enough to catch the sliders so adjusting idle with these is useless...