I recently purchased an '02 GT and the previous owner told me the number 3 plug had blown out and they had a helicoil installed. I'm wanting to swap out the plugs when I change the injectors. Should I avoid number 3 all together, or just treat it with the same caution as the others? This is my first 4.6, and am learning that it needs to be treated a little different than my 5.0s. Thanks for any input.