I had similar problems.
Removed the ballast resistor and changed the coil to a gt40 - still intermittent misses.
Found the advance ring in the dzzy was seized - cleaned and greased it - qworking properly.
Redone all the wiring connections as I found suspect crimped connections at the coil in particular the wiring going to the gas safety switch - fixed.
With the changes Im now getting better fuel economy.
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