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Mazda cx-7 sport rough idling on start

Mazda CX-7 sport that has rough idling when it is started and goes away when warmed up or driven. Is giving OBDII error code P0300 - multiple misfires. Where should I start looking?

How many miles on the SUV? I wonder if it might need new spark plugs?

75,000

about right for needing new plugs/wires what model year is this?