Hi,
As far as locating a vacuum leak, there are a couple of ways. First, with the engine running, listen closely for a hissing or whistling sound. Also, using carb cleaner, the engine will increase in RPM's if it's sprayed near or on the leak. Take a look through this link. It explains how to locate and repair a leak.
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
I attached a pic below showing the charcoal canister filter routing. Check around this area as well. I highlighted several vacuum hoses.
If you have a diagnostic trouble code, let me know what it is. That will point me in the right direction.
Take care,
Joe
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Thursday, December 16th, 2021 AT 5:17 PM