cylinder 2 was dead, I swapped only the 1&2 spark plugs and the problem...

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cylinder 2 was dead, I swapped only the 1&2 spark plugs and the problem moved to cyl1, so I thought it must be a bad spark plug,... then I swapped only the 1&2 spark plug wires and cyl1 remained dead, then I swapped the wires back... the cyl1 wire is sparking when removed from the spark plug, the cyl1 plug is sparking when the wire & plug assy are removed from the cylinder chamber. can it be a bad plug even tho it is sparking??