it seems like until 1/4 throttle it wants to run on one cylinder. i just did the cross over mod. have 12 mod and twin air big air kit and exhaust. #42 pilots and dyno jet needles on 4th clip. it idles ruff and low speed riding u can hear it running ruff. i have adjusted the air screws but it makes it hesitate off idle and the ruffness is still there. anyone have a suggestion for me?