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I agree that 7s and 9s are fine for a stockish configuration on a FD. IMHO platinum plugs are a waste of money on a rotary, the BUR7EQ and BUR9EQ is fine, just specify a 1988 Mazda RX-7 if you're going to an auto parts store.
A plug that is too cold for your driving habits will foul out quicker and this will lead to harder starts, poor gas mileage and a reduction in power. Exactly what do you mean by popping? Loud bang, light pops, flames?
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