I'm betting it's the coil.
You can measure the resistance with a DMM set to ohms.
With the coil completely disconnected, measure;
1) Across the primary terminals (where the small wires go).
It must be between .3 and 1.0 ohms.
2) Between the negative primary (dark green wire) terminal and the secondary output terminal (where the "coil wire" that goes to the distributor cap goes).
It must be between 8 and 11.5 K-ohms.
If it fails either test AT ALL, the coil must be replaced.
Or, if you have a known good one, just substitute it and test drive it.
Take care,
~Chris
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