You could also try putting the suspect plug into cylinder #2 and see if the problem moves with the plug. If the Durametric still shows a problem with #1 cylinder, then there's a good chance you have a faulty coil.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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