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Weak
battery
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Loose wiring or terminals anywhere
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Prematurely grounded primary wire
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Broken wire inside of insulation
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Broken spark plug insulator
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Defective
condenser in coil
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Dirty
spark plug points (sooted or oily)
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Dirt in battery timer
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Pitted
platinum points on timer
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Gummed oil in timer or distributor
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Weal spring, timer bell crank
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Wrong spark gap at plug points
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Poor
adjustment of contact points at timer
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Worn
points in timer
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Leaking
secondary distributor head