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Originally Posted by MNBoxster
Hi,
I can't see al the advice proferred here, but I seriously doubt that is a Sleeve issue. This is a non-issue on '99s (it's a '98 thing) and have never heard of this issue popping up on such a relatively high mileage car (62k+ mi.).
MAF is a possibility, especially when you add in the K & N variant. Just wait to see what the mechanic says. Good Luck!...
Happy Motoring!... Jim'99
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On most other sites I have read ( such as pca.org, search "Boxster cylinder liner", the slipped sleeve problem is a model year 99 problem (something like those manufactured 9/98 to 3/99). Some 98 models suffered from porous blocks.
In any case, porous blocks and slipped sleeves usually show up very early in the car's life.