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plugs are installed, and the car is running smoother. it could just be me, but i noticed that my car doesnt have anymore funky idle issues like it used to. i still have my occassional bouncing (650-950rpm) after some spirited driving, but that only happens for a few seconds before it stabilizes. high idle on cold starts still exist, but dont last as long anymore.
overall, i am pleased with copper, and wont ever go back to platinum, or iridium for that matter.
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