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Bad Plug, Bad Plug Wire. If distributor. Bad pole on the cap. If coil pack, bad coil. Make sure your wires are not crossed at all. They should not touch each other anywhere on the vehicle. With it running, use a fine spray bottle of water and mist the #3 wire and see if you get an electrical jump.

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Q: What is causing your number 3 spark plug not to fire?
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