So my 2005 Neon about a year ago spit out the left or very right spark plug if you're facing the engine. I was on my way to work when It happened. I was able to pull over in a parking lot. I re-threaded it back in, with no problem. It happened again a couple months ago, same result. Three days ago out of the blue it does it again. This time after threading the plug back in and starting my car it blew it out of the hole taking all of the threads with it. Now I was looking at heli-coil, which I've never done before. There is also another competing product or products. One is called a Time-Cert, which is supposedly a more permanent option. The other is the "Fail proof " C-Sert, which according to information online it's a better anchor. Now how many of you done this with useable results? Anything to look for when Either Heli-coil or Time-Certing new threads to hold a spark plug. My dad thinks that the original owner, who only commuted 2-3 miles to work, and exclusively garaged it, and maintained it by the book had someone cross thread the plug just enough where they could get it back in. After doing some digging, it looks like this is a common problem on some of the Neon forums. All help/ suggestions appreciated.