Hey guys, i’ve got a 2006 Mustang GT with roughly 215,000 miles on it. It has been about 10 years since I last checked my spark plugs. So I kept getting a misfire in cylinder 4 when I was trying to accelerate at highway speeds. I checked the forums and many of them suggested a bad spark plug or coil. I’m a big DIY guy when it comes to my pony, so naturally I started with some new plugs all around.

On one of the spark plugs, the threading came off of the porcelain. I rented a tool from...

Another broken spark plug job