Some people have had luck with Platinums in the 4.7L motor only but not great luck to say the least. Everyone I talk to pulls them out and replaces them with great results. In fact I don't remember ANYONE that didn't love the results.
Also remember this:
Don't put a Japanese plug into an American made motor!
Get those POS plugs out of that motor!

......IMHO!
You ONLY want Champion regular Copper plugs (OEM) $2 each, Champion Truck plugs $2.70 each, Champion Iridium plugs $8.99 each,
also some people like the Autolite 3923's $2 each in the 5.2L and 5.9L. I do not encourage their use. Read through this thread:
Longevity & Power Of Your Rig!
Quote:
Originally Posted by benchwarmer
Maybe it was something I ate then. lol
Egg begets egg fart
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^ Now thats just plain funny! ^
Like I said, "take the parts to your shop and have them install them".