Can a broken oil dipstick guide create a vacuum leak??
Yes, it can.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
Good way to test is to run the engine with the oil cap on, and then take it off to see if it causes a difference. If you take the cap off and it does not change, it is likely there is a leak.