[Adger Smith]

Ben,
Please don't take this the wrong way, but "Looking good and being good" are two entirely different things. There may be a problem there. I would "Check it" with a Volt /OH Meter to see if it has high resistance. Some of them are spring loaded and can burn the spring out. I've also seen the path from inside the cap to the brass contact broken by being burned out , yet it "looks good" on both sides, resulting in Open circuit or high resistance. I think you need to go over the eletrical system with a fine tooth comb. get friendly with your V/O meter and check the system, loaded, not static. "Load it" by running the engine. It could be a switch that "looks good" but has high resistance when a load is put on it. I would even put another battery in it. I've seen batterys in some dirt cars look fine and load check fine, but when you load them with "G" forces the plates bounce around and arc internally and kill the ignition. Start taking loads off the battery and you might want to put a dedicated one for just the ignition. Have you tried moving the plug gap down a little to see if the miss leaves? I've had that happen and it could indicate several things. Not "enough" coil output to jump the spark at the plug is usually the fix for that. The acting like it is running rich and your carb guy says the carb is healthy makes me think the electrical system is suspect. As the "Engine Guy" I usually end up figuring out what the problem my customer has because it is always "My Engine" at fault. I've got a long list of "silly things" it always turns out to be. Don't get tooooo frustrated. Problems like this can make you ... well, you understand.. :~) Good luck.