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This is the process of diagnosing a code PO302 Cylinder #2 Misfire. Cyl #2 spark plug ground electrode broke off inside the cylinder then flies out during start up. The piece could have caused serious engine damage if it did not come flying out the hole @ 5:20 Seconds into the video. Point always do a visual inspection on your wires and spark plug first if you have a misfire code, Stay encouraged put Jesus Christ first God Bless.