Went on my search for the vacuum leak. Still no apparent damage can be seen as I traced past the vacuum canister. The brake booster connection looked good too. But the oil cap mentioned above concerned me. So I got her putting along and removed the oil cap. I saw no difference in performance. So I traced the oil filler tube in the engine compartment. But I couldn't find any damage, cracks, or oil leaks. Can this filler tube (any of the three pieces) or even a bad oil cap (mine looks yellow) cause a massive vacuum leak? Thanks in advance.
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