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You could run a test light across the coil and have it sticking out the bonnet whilst you drive, if it goes of then you have a power problem. After that run a high tension wire from the coil out of the bonnet and put it in a clear tubing and have a small gap and run another wire back into the dizzy. That will let you know if the spark is dying. Then you can do the same with injector signal using a led test light.
Intermittent problems can be a pain. I remember years ago A vehicle wouldn't start when it was cold, but ok as the day warmed up. I put the ignitor in the freezer and it failed.
Good luck.
JD
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