Haltech E6X, wired correctly. Put the timing light on my trailing wires, front rotor first, to make sure I had my timing zero'd and the light didnt flash, so I can only assume that I was getting no spark. Put it on rear wire and the spark was intermittent. Whats going on here?

Just an idea I had tonight. Pulled my plugs and the trailing plugs were a little grimy. They COULD be fouled, not sure though. Would a fouled plug cause no current to be passing through the wire to the plug itself?

First disconnect one trailing wire and ground, while car at idle to see of spark, then try the other. If spark jumps from both wires, then it's plugs.