I don't know if I'm paranoid or what...but it seems that my L idles a bit rough, as if it's slightly missing. Will a plug change help this? I've done searches and found that these stock plugs look like crap after a few thousand miles, which concerns me....Which plugs are the best to use(I don't race at the track) and what is the gap on them?

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Red SVT 2001 Lightning

 

I had a missing problem, I ended up having a bad coil pack.
Jeff

 

I had a miss at idle. It was due to crappy gas. I put some fuel treatment in the gas and it went right away. I have a slight miss (intermit) at about 1800 to 2000 RPM. I am thinking bad gas again.

 

Maybe I'm not used to the grumble of the 5.4 at idle. I just saw some posts and pics of factory plugs and they looked scary! I use Mobil or Exxon 93 octane gas ONLY in my L.

 

Mobil and exxon are two of the WORST gasses on the market! Try some ammoco 93 or sunoco 93.You won't regret it.