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It seems to be the coil pack. The insulation on the two low-tension leads is cracked where they enter the coil. The coil was still sparking consistently, but it didn't always seem to ignite the contents of the cylinder. The arc in my inline spark tester would change color slightly when it misfired, but it never stopped arcing. I figured an improper fuel mixture and resultant misfire would change the impedance and thus, explain the slight change in spark color. I guess not. I'm not sure why a little bit of deterioration of the low-tension wire insulation would have any effect on the performance of the coil, but I also can' t figure out where the opposite pole of the high tension circuit is. It doesn't seem to be the bolt that attaches to the head, so perhaps it gets its ground from one of the low-tension leads. ??? Very strange.
Incidentally, screwing around with the fuel injector plugs produces an error code in the ECU, but it doesn't trip the trouble light.
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