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Injector ground maybe? if they're all grounded the same place.
In troubleshooting toyotas there was a circuit wire that transmitted a signal back to the brainbox that the spark had indeed occurred. If it did not receive that signal the brain would shut down injectors in order to prevent damage to the Catalytic Convertor. So if that wire was broken you'ld get a pop at most before it shut down. Maybe some variant of that on the Mazda system
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