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During Rendezvous 928 2021 in May, several of us selected the Brumos Museum Tour option. The 969 predecessor, a 1985 959, was there which also had some very 928-looking bits!
Some great 928 info and pics found in the STUTTCARS article referenced in this thread, including these:
FINALLY! I have 675 rpm idle...with the aftermarket ICV no less! If you haven't taken a few min. to swap out the o-ring on the dipstick tube and put a new dipstick as well you probably have a vacuum leak..the old o-ring that came off the dipstick tube was at least 50% larger in diameter.