Hi guys, posting for a friend because I'm absolutely perplexed. I don't have access to the car but I will in a few hours. There is no way to really describe it so check out the video attached. Any ideas what it could be?

 

Put it on jack stands and get underneath it while starting it. Sounds like a loose plate/bracket (flex plate window) or something. Upload to YouTube and link from here on out. You're not getting a response because nobody wants to download your viruses.

 

I've been researching with no progress, here is the YouTube link User1 suggested:

 

Also, the car now sounds like it's wanting to stall while idling (it goes "vroom bububub vroom bububub vroom"). Oil seems to be leaking from a sensor in the timing chain cover on the left? Not sure if that is related to my problem or not...

 

For anyone that stumbles upon this, the culprit was the AC compressor going out. It supposedly still wants to stall every so often but the ringing was 100% from the compressor.