How can you tell if you foul a plug? Does it just start missing?
Is it easy to feel the miss in our trucks?

 

I currently run NGK BR7EFs(colder) because of the added boost(see sig) and the fear of detonation. They do not allow detonation but they do miss/foul at low rpms. I take my L out of O/D when in town. It's just a slight skip/hesitation. Because of this, I am changing over to Denso IT24s which don't misfire even though they are colder too.

Btw, my OEM plugs never fouled or misfired(to where I could tell) and got me into the 12s with a 3 lb pulley.

Dan