That was my thought too - the ignitor since the tach signal comes from it.
What I found:
After consulting a former Honda mechanic that now works at a nearby Autozone, I returned the ignitor unopened and picked up a refurbed distributor assy and rotor/cap. Didn't even look at codes before pulling the old dist. Don't ask me why, that's just the way it went down.
Anyway, I pulled battery out, then plug wires, then the cap and looked inside. Rust and corrosion. Then it immediately occurred to me. Last August the upper radiator hose nipple cracked and broke and spewed steam and coolant all over the place. I replaced the radiator and a month or so later a coolant line to the throttle body split and again spewed coolant and steam all over under the hood.
That is probably what sent the distributor to an early grave. I had it replaced about 3 years ago and that was a year or so after the upper tank split on another radiator.
So, it appears radiator and cooling system failures ain't too good for the distributor.
This time I assembled with silicon high voltage dialectric grease under the cap to seal it up better.
Tell ya one thing for sure - it runs MUCH better. I never posted all symptoms as I was just looking for fault code assistance. But it idled rough and had some rough spots around 3-5 grand on the tach which I attributed to dirty/faulty injectors. Probably dumped 10 gallons of Berryman's and other injector cleaners into it.
The distributor evidently was going south over a period of time and the coolant accelerated it's decline.
The car runs way better - real smooth and mucho more power. It barely passed emissions last time. I had the cat replace a month or so ago knowing it was fried. Between the cat and ignition limpling is most likely why hydrocarbon emmisions were high.
I expect now it will easily pass emmisions.
All I need to watch for now are RADAR guns.
It would be premature to declare victory at this point. I'll get back here in a week or so and tell you if it's fixed.