For the guy who wanted to know what plugs work nice.

I installed a set of Rapid Fire plugs and can notice smoother idle and accleration. I am guessing the others were worn and had 40k on the old set... but the rapid fires work just dandy in a 2000 5.2l. I got them at autozone.com

I think this company has gone with a few dif changes. I recall the inside used to be star shaped. This new type seems to be thin like pencil lead.