Hi,
What you described sounds like one of the exhaust manifolds is leaking exhaust fumes. A vacuum leak wouldn't cause air to blow out. It would suck air in. Is it possible for you to take a pic of the item you are referring to and record the sound so I can hear it?
I attached a pic of an exhaust manifold. Does it look like what you are referring to?
Let me know. Also, if you can take the pic and record the sound, it will be helpful.
Take care and God Bless,
Joe
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Tuesday, February 2nd, 2021 AT 4:46 PM