What do you think about these plugs?

Hey fellas, so I have been all go no quit doing some upgrades to my GT500. Wasting no time. I don't believe in leaving plugs in for more than 30k miles, so I went and picked up some Motorcraft SP405's, which is what it calls for stock. I felt a little misfire and some sputtering here and there. Anyways, took the plugs out and this is how they came out:



Car is bone stock. No CAI or tune yet. Car is running much better now and throttle response has become more crisp. Those are pretty shot for a car with 29k miles on it... What do you all think?

Good, maybe a little rich.

Torco?

vnmous1 said:

Torco?

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Not quite familiar with Torco. Are you talking about the additives?

I like to do plugs every 10k miles or so or every other oil change on a boosted car.