Hey guys, I've had a 97 F-150 4.6L for a couple years and just stepped up to an 07 F-150 SCrew 4x4 5.4L. I love this truck and wish I would have joined this group sooner! We tow a racecar every couple weeks through the summer and this truck should handle that with greater ease. I also own an 06 Mustang GT so I'm familiar with the spark plug changing process. In the Mustang world most people use the Autolite HT1 plugs. However a search hear didn't turn up any useful info here. Are some of you guys running the Autolites? If so, any feedback on them?

 

I think most use the OEM motocraft plugs to put back in. Some other guys have ran into issues running others.

Also check this article out, it will help determine if you have crap plug design or not.

https://www.f150forum.com/f4/5-4l-3v...30-07-a-56871/