small vaccum leak?

[350sexZ]

A few days ago I suddenly got some weird idle. I think it's some small vacuum leak somewhere. Driving is fine air/fuel reads about 13.3-14.3. It's when I come to a stop the car air/fuel starts getting jumpy, vary's from 12-16. It's will dance from 750-500 rpm. Feels like it wants to die when it's at 500 then recovers for a moment. Checked couplings from intake and seem fine. Any other ideas what or where to check out? It's aliitle worse when ac is on. This video is with ac off.

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[350sexZ]

[ame]

 

[EcoBoostang]

Could be a vacuum leak... what octane of fuel are you using? Also, where are you buying it from a reputable station I hope...

 

[GT Pony]

Your fuel ratio is bouncing all over the place. Could be the cause or the symptom. Doesn't seem normal to have the fuel ration bounce like that.

 

[350sexZ]

Could be a vacuum leak... what octane of fuel are you using? Also, where are you buying it from a reputable station I hope...

I run 93, I did fill up at a sketchy station about 4 days before this started, I thought it was bad gas as well. Finished that tank and refilled with shell 93, more than half done with that tank.and still idling weird. I use either Shell or Sunoco 93

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