Just curious, is there any proof that it is the IMSB? There are other things that happen (like chain tensioners etc.) but the IMSB always gets blamed. It not being the IMSB may or may not make a difference but I read a long thread on a 996 engine rebuild, with similar symptoms but it was not the IMSB and the engine was rebuilt.
https://rennlist.com/forums/rennlist-canada/706081-dragged-home-one-of-these.html
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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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