Jackhammer like noise under hood

You mean timing chain. Here’s what it looks like:

http://www.allfordmustangs.com/forums/2005-2010-v6-mustang-tech/654105-2006-4-0-v6-left-timing-chain-cassette-tensioner.html

@Stangkid1129 Thaanks for the update, and glad you are up and running!

Yeah, sorry I did mean the timing chain!

After changing the front timing change the mechanic after further inspection realized my car never got the 60k maintenance so now he’s replacing the back timing chain and all the gaskets, ended up be a lot more expensive than expected. Lol