vacuum hose leak?

1986 MERCURY COUGAR
16,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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FRANKQUALLS
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car starts and idles for like 1-2 minutes and somewhat of a hissing noise under engine bay. I don't know where all of the hoses are, a diagram would be nice.
Sep 12, 2024 at 8:21 AM
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STRAILER
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Here is how you can find the vacuum leak and I have included the vacuum line routing diagrams as requested.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Check out the images (below). Please let us know what happens.

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Sep 12, 2024 at 10:20 AM