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Iridium conducts well, and it's the second hardest metal with a very high heat resistance, so it's perfectly suited to spark plug use in any kind of engine. All we need it to do is put a spark across a gap. When using an iridium plug, you can widen the gap a little to increase the surface area and temperature of the spark. This improves the initiation of combustion.
I wouldn't blame the plugs for the hesitation, unless you're getting a true misfire condition.
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