Dave---You may have already done this, but if you still have this
misfire, try going over these steps again.
Occasional misfire on the same plug wire needs to be traced backwards.
The sparkplug itself plays no part in this, if the timing light shows a
Exchange this #1 wire with one of the other plug wires to see if the
misfire follows the wire.
Flex the wire as the timing light blinks. =8 - #
Stop the engine so #1 is on TDC, or 10 deg. before. Take off the dist.
cap. The rotor tip should be in position at #1 plug wire cap tower.
There should the no doubt that this is the wire that's going to get the
It would be rare for just one plug wire to misfire, if the problem was
from spark scatter, or the rotor being out of phase. Move the timing
light to other wires long enough to confirm that is the only plug not
getting spark. Shine the light so it picks up a fan blade. (Also good to
see if the variation occurs equally)
Hang in there. You'll probably smack your forehead when you discover the
.............. - miss on plug 1, can be seen using timing light.
Plug 6 shows stable timing (as stable as can be expected with a 30+ year
old dizzy). Replaced cap, rotor, plug wire, plug - no solution to the