Eric,
Test the two non-firing wires for end-to-end continuity ... they should measure 3000 to 4000 Ohms.
Another rare possibility is defective, shorted spark plugs. I have seen new ones that were shorted!
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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