You might try switching the coils from one side to the other. If the misfiring cylinder moves to the other side then you will know you have a bad coil or wire. All that this will cost is the time to do it. Just do one at a time that way you will know which one is bad if there is one bad. This reminds me of a time when I had a car all tuned up and picked it up at the garage and started out on a trip. The car would not run over 55 mph so I found a town with an open garage. After a couple of hours on a Sun machine I got desperate and pulled the old coil out of the trunk and re installed it in place of the brand new one. The car ran fine then. Up till then I had always believed the mechanics saying a coil either works or it doesn't. Well I had one that only half worked and I no longer assume new is good.
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