[ianc]

Coil resistance is not necessarily a good indication. If you have a spare hanging around, try swapping them. It does sound electrical though... How are the grounds on the left intake runner?

O2 sensor is out of the loop until the engine warms up because it doesn't produce a reliable signal until at high temp. You can easily test this by just disconnecting it; it is not required to run.

I would devise some means of testing spark and fuel while the engine is running. Cheap inductive devices to display current in plug wires near them are available at sears, or just go the old fashioned route by pulling a plug wire and connecting to a spare grounded plug. A noid light on a single injector would let you see if the injectors stop getting juice just before the engine dies, or only after. You could attach a fuel pressure gauge to the test port on the left fuel runner and monitor it as the engine dies. You need to narrow it between fuel and spark, then work from there...

ianc