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Old 06-13-2008, 05:15 PM   #182
Join Date: Jun 2007
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Location: San Jose, CA
What I Drive: 2004 Infrared SVT, EAP #1440

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I've gotta tell ya,

I experimented a bit. The idle was a little rough so I checked and re-gapped my standard platinum plugs... lesssened the gap to .055". The idle was ok, but felt much weaker than the previous .060" gap.

Then I invested a whopping $13 in a set of copper core motorcraft plugs and set the gap back to .060"... I am more than pleased with the results! couldn't tell you how much horsepower gain, but the throttle response is a lot better when blipping for a downshift, it winds up a lot easier on acceleration from low speeds and top end acceleration is improved as I don't have to step quite as far into the gas to pass cars on the freeway.

for $13 and 30 minutes under the hood I can't think of a better investment.
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