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Did you inspect the coil packs when you removed them to access the plugs?
Look for small cracks and corrosion - once moisture penetrates the electrical windings of the coil packs, the voltage tracks to ground causing the missfire.....
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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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