On my Evo, every since I brought it, it ran bad. It would back fire through the carb and it seemed like the rear cylinder would cut out. This winter, I redid the top end and got a different manifold and a CV carb. Once I completed the rebuild, the back firing stopped but now the rear cylinder still seems to either not fire or cut out. While idling my front cylinder is HOT and the plug is burning correctly, but the rear cylinder is warm and the plug in burning rich. I tried a coil off another bike with the same results. I still have the stock igntion. Could it be the ignition module or something else?