Hey guys i just got this thing running and i could use some help. i replaced the plugs and tuned it up. I kinda hesitates to fire at first but then it sits at about 2000 to 1500 rpms. When i go to drive it, it feels like it has no power then at about 3500 to 4000 it starts to bog real bad and stutters. Does anyone have any idea of what this could be please let me know thanks guys