Rough engine idle

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96 LS w/ the stock b18b... replaced plugs, wires, dizzy cap and rotor, oil/filter change. Air filter is new, no leaks anywhere. However, it still has a rough idle. What else can be causing this. My only thoughts were fuel filter (which I have and am going to put in) or possibly a clogged injector.

Air, fuel, and spark are needed for a combustion, duh. My air intake system is kosher, and for the most part my spark system is all brand new, so it must be a fuel problem right?
 
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