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Why would you change the type / spec of the spark plugs from what Porsche recommend - and pay a hefty premium for them to boot?
Running non spec plugs is worse than using the wrong oil - if it goes wrong, you can have serious problems !!
If you have a missfire & you don't know the history, go back to basics and change all 6 plugs to either Beru or Bosch as per Porsche recommendations. While you have the coils unplugged and on the bench, check visually for corrosion and cracking - if in doubt, replace.
If they look OK, swap the suspect coils with good ones from other bank, clear fault codes and start the car - if the fault codes follow the suspect coils then you have your answer....
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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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