my car is all stock and it sputters for about 10 seconds when I start it up... NGK is probably the best spark plug you can buy for your car, unless they sell some that aren't like 4point platinum or whatever and you bought those, but if they are the platinum NGK plugs I doubt thats your problem... maybe the company you bought the wires from is bad? never heard of them so I couldn't tell ya, but my guess would be the coils, even if its not the problem, you'll still have better coils 
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1989 RX-7 TII --- Just got rebuilt and street ported
RB 3" dual exhaust, BNR stage 1 modified factory turbo, FCD, S-AFC II,
720cc secondaries, Aftermarket Turbo inlet duct w/K&N, Hawk HP+ pads
HKS Blow-Off Valve, Stainless brake and clutch lines
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