Do I need a new MAF or do I have a vacuum leak?

So my check engine light came on yesterday, and I read the codes and it said that it engine was too lean, and it could be a MAF issue.

So today I took it out, sprayed it down and put it back. Revs were high when I first started it this morning (1,250) but after driving for a bit, turning it off and restarting it they were down to 750 at idle. The idle feels a little inconsistent but nothing crazy.

I also noticed a hissing noise but that could be from my K and N air intake... I can’t remember if I’ve heard it do that before. Anyway, the seal on the MAF is pretty old and I might need a new one, or it’s a vac leak somewhere else, or a ton of other things. Any help would be appreciated!

here is a link to the hissing noise: https://imgur.com/a/0xIGrgo

 

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