misfire code on 2002 Mazda Protege5

No. 3 misfire code comes up. How do you check secondary ignition system for malfunction and fuel injector malfunction?

Asked by for the 2002 Mazda Protege5
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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