I am having a problem with my 225. Engine idles fine. when I give it any throttle it sounds like it is missing. I have dual exhaust and the miss is comming from the left side.I am firing good on 2,4,and 6. I can remove plug wires wile running on 1,3,and 5 all at the same time and there is no difference, other than the engine smooths out and sounds good. Any advice would be great.