Q: after everything I replaced , what else could be causing my misfire on the #2 on 1996 Mazda B4000

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I have replaced the spark plug, spark plug wires , coil pack and fuel injector. but my scanner still detects a missfire on the number 2 cylinder. What else could it be.
(2) Answers
(2) Comments
Low compression, vacuum leak or no injector pulse to that injector. Code P0302 to start with?
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