"...a second possibility is one or more of the thin wires leading into the coil connector are internally broken or frayed. ..."
However, from your problem description, #3 has a problem regardless of which coil is being used in that position.
If the harness connector doesn't turn out to be the issue then maybe you could probe or tie into the wiring where it approaches the coil connection and see if you can detect a break in electrical impulses while the engine is running.
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)
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