Hi all, I suspect I have a vac system issue in my beloved "Stella" (S123 chassis). The transmission is acting up; she has sluggish shift (and sometimes none) from 2nd to 3rd (but generally not a lazy response in Drive overall).
Are there specific places which notoriously leak that I should check first, or is it a seek and find?
Also, the locking system sometimes doesn't respond to unlock, which makes me think this is more of a vacuum issue than transmission fluid or something else, but I'm by no means very knowledgeable mechanically. TIA for your insights!