Picture of my plugs from 4 & 3 respectively.

I'm getting spark to the plug and when I switched 3 & 4's plugs still no difference with the plug wire pulled on 3, but 4 caused the idle to stumble. What are the chances 3's wire is not letting enough voltage through (slim I guess)? At least we know both plugs are good but I was hoping that was the problem. My next step is to change the wires, since we know it is getting fuel and from the looks of the plug it was getting spark at one time at least. So if that doesn't do it (and I don't think I'm that lucky), then time to check my valve adjustment?

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