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Q: misfire code on 2002 Mazda Protege5

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No. 3 misfire code comes up. How do you check secondary ignition system for malfunction and fuel injector malfunction?
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When you have one cylinder misfiring (cyl #3), you can start swapping parts to other cylinders, move the coil to #1, spark plug to #2 and the injector to #4 cylinders, erase the code, run the engine until the code is reset and see where the fault move to, for instance, if it moved to cyl # 4, then the injector is bad.
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