I have read of AOS problems so that might be a possibility, and I have never charged the coils so thanks for those suggestions.
It does smoke a bit on start up occasionally but there is no apparent oil use and I thought this was just one of the Boxster characteristics.
The car was MOTd a couple of weeks ago and emissions were fine.
I warmed the car up this morning and it seemed to be running well so I took it for a fast run. It cruised smoothly at 85 for a couple of miles then started to misfire and lose power. OBD showed misfire on 456 so my thought that this was only a cold running problem was wrong, although it is much worse when the engine is cold.
Thanks for the suggestions so far, any other suggestions are very welcome.
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