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Change the oil and take the old filter apart to see if there are any particles visible. Check all the fluids and the air filter. Have a diagnostic test done. Perhaps check the cylinders with a borescope. I would then drive it for awhile to see if there is anything obvious, then I would change all the other fluids and bring all maintenance items up to date as in a major service. The service schedule is available online.
I am one of those that thinks the IMSB problem has been exaggerated. I'm sure you will get several responses saying that the IMSB is the first thing to do.
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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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Boxster
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