What is a Resistor Spark Plug?

Buy DENSO 3031 Resistor Spark Plug, compatible with Dodge Ram 2500, Ford Mustang, Dodge Dakota, Toyota 4 Runner, Nissan Datsun Pathfinder, Chevrolet

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Gl3r Resistor Spark Plug, Replaces Champion Rj19lm

What the difference between a resistor and non-resistor spark plugs?

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Spark Plug Question 1939 Chrysler Royal - Technical - Antique Automobile Club of America - Discussion Forums