OK...here's the update
Cleaned all the contacts in the distributor and re-grounded the igniter per the instructions in your post.
No change.
Changed spark plug wire 2 to the 3rd cylinder and vise versa.
No change.
I can pull the plug wire off at the distributor cap and see the spark jump from the port on the cap to the end of the wire if it isn't far enough away, so it looks like both cylinders are getting spark.
But still...cylinders 3 and 5 produce no discernible change in the idle when I pull the wires off.
I re-re-re-verified the timing. Still right on at 10 degrees BTDC.
What's next? Am I looking at an injector problem or something?
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