hrm. I have a problem with mine somewhat like that too. banshee wants to be abused. i noticed that when i take my girlfriend out and have to drive slow (but fun ;-) ), eventually a plug kills itself because it is bored. then i have to buy new plugs and it runs good if you beat on it. the 350twin doesnt ground the cylinders individually, the spark goes in through one and comes out the other side. sometimes if im not treating the 'shee right, and one cylinder quits, but i switch the wires to put the strong side of the sprk on the dead cylinder and the plug cleans itself. just keep it wide open lol. haha this prolly didnt help any but thats what i figured out.