You only want to use Motorcraft or Autolight copper plugs - for some reason the platnum plugs cause issues.
The torque spec is VERY IMPORTANT on that year of 5.4 engine. Its an aluminum head with only 4 threads on the splug, its extremely easy to strip the threads by over torque (only 12 to 14 ft. pounds torque).
Its also not uncommon to strip the threads out of the head when you loosen them - the aluminum galls to the spark plug and just rips the out. So make sure you can get the wrench on square.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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