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Since day one, mine's had a barely noticeable irregular beat when idle and AC is off (950 RPM)... just the nature of the engine's harmonic vs the shape of everything around it. Bring it up to 1050 RPM (A/C on) and it's smoother. Only seems like a defect if you're used to a larger engine. I'm running stock everything - so if new plug designs smooth it out, I'll upgrade because that means cleaner combustion at idle - which is a lot of time in city streets.
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