I would doubt that the problem is that the plugs are not Bosch. Much more likely, as suggested by STL-986, one or more coils are not properly seated on the plugs or that a coil wire is not properly inserted all the way into the connector, they can be difficult and if you don't pull the rubber boot back you can't see if it is not seated.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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