Save your money and don't buy platinum plugs. They only supposedly last longer, not fire hotter or such.
Get a new air filter, or clean the K&N if so equipped. If you're doing the timing chain, maybe look into pulleys. 84k isn't that high if it was taken care of.
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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13
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