Help needed, spark plug gap for 2003 e150 4.6L v-8

Look at the emissions label under the hood.

i would say its most unlikely the plugs. they are just sitting there with no moving parts. what can go wrong with the plugs?

You mean besides the worn electrodes changing the timing and spark quality? Or the failure of the porcelain insulation causing the spark to fire inside the plug instead of at the gap? Or the build up of deposits on the plugs causing miss fire? Or maybe the upper porcelain failure causing arcing outside the cylinder? Or even the internal resistance changing so that the plug will not fire under compression? Just a few items that can "go wrong with the plugs"

Google works great. From our friends at the Motocraft website. Be sure to clean the plugs too. And if they look realy fouled up I would use this as an opportunity to replace them all.

Select Part Number Part Description Qty Per Vehicle Buyers Guide SPARK PLUG GAP .054 97-03 SPARK PLUG GAP .054 97-04