My INFINITY QX4 1999 car jerks, black soot on the plug and also on the exhaust, accelerates slowly.

My INFINITY QX4 1999 car jerks, black soot on the plug and also on the exhaust, accelerates slowly. I have changed the distributor, air flow meter, plugs, fuel filter, cleaned filter on the injector. With all this, the problem still continues as the car tachometer moves to below 0.5 when stops. This problem was first noticed after travelling for two hours, the struggled to climb a hill.

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My INFINITY QX4 1999 car jerks, black soot on the plug and also on the exhaust, accelerates slowly.

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