jesussaves, sounds like an air leak to me. also try an os-p3 plug. Make sure your head is on tight and shimmed correctly. I had a gen4 5 port that did that to me. Was an air leak at carb pinch bolt. Also check the needle seals. I would seal it up, put in a p3 plug, check needle seals in original carb and put it back on. and try again. Also preheat engine. Set idle gap at .1mm hsn flush/lsn 2 turns in on original carb. Oh and one last bone head thing I once did,forgot to put carb restrictor in place!