Get the fault codes read (Durametric is a good choice) and this will show which cylinder(s) are faulty.
Untill you can read the faults, you are guessing at what the problem is.
For instance, you could have 2 faulty coil packs, and with the weather you have been having in the UK, you can chase your tale tracking down the fault......
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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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