OK, Looked at the coils and aside from being tan, green, and blue connectors it appears they are identical. I was thinking on the way in that you could just buy the longest one and swap it to each plug til the culprit is ID'd, and I find another new thread about the same subject (bad coil) suggesting the same thing. If the miss/cough is regular enough the FI suggestion I made previously will work. That's how my tech figured it out when I had a "definite" miss and failed coil. I suppose the spark plug boot/silicone suggestion could work as well, but I hesitate to "R Goldberg" it, only to be redoing it again later. Just anal I guess.
Glenn