vacuum leak problem that I just noticed?

It could be the intake gaskets, a vacuum line or the fuel injector O rings have let go, you may be able to figure it out better by going over this guide:

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

I have included the typical leak areas in the images below. Please upload pictures or videos in your response of any problems so we can see what to help you with.