Chirping noise coming from rear of car/engine

[Ressler]

So I posted about this in my into thread but figured it'd get more discussion in it's own thread. I am currently trying to find a way to post video (if you have an Instagram I put one on there @resslerbmx) anyways, it's a pretty loud chirping noise, happens when idling and anytime I'm on the gas, it's getting annoying and it's finally the weekend so I want to fix it. I've heard it's possibly the spark plugs, if so I want to replace them all, I've also heard belts/pulley bearings. Is there anyway to test this? Been searching for an answer all day and don't want to bring it to a shop, I'd rather give it a shot first. Thanks guys! Appreciate any and all help