I took my vmax out for a weekend ride and revved it to the limit in third gear and now it's missing. I changed all the spark plugs due to them having dry black carbon on them and it is still missing in first and second gears. I can't really feel it in third on to fifth. It will sometimes quit while idling also. I bought a new ignition box from Morleys muscle and it ran great for a couple months. Can anyone give me an idea what I should check?