I'm betting that the OP has at least one coil pack with a cracked surface...
Having a high pressure under chassis water wash or driving at high speed in heavy rain will cause a faulty coil pack(s) to "short" via the water to the chassis instead of firing the plug(s).
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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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