I had this mechanic friend of mine change my spark plugs I made sure they were the correct gap prior, right after we changed them the car instantly had a misfire but no check engine light yet, he had the grand Idea too rev it hard multiple times 5000 rpm to see if that would fix it, I noticed he was an idiot at this point, he checked the plugs again and said they were fine and that he doesn't know what it could've been and left me to die basically saying it wasn't his fault I decided to drive slowly home and I had another mechanic come to my house and check it, the guy that did it before had left a little of anti seize right in between where the spark plug "sparks". We changed it out and everything was fine till two months later the car had been sitting in the garage and it started up weird with the cabin and dash lights flickering and when the car warmed up it started to make a new noise, I quickly revved it too 2000 rpm to get a better listen and now I am freaking out. VIDEOS BELLOW TO LISTEN.