1999 GMC Savanna spark problem.

Hello all ...well ..99 savanna 5.7 1 ton I just went thru the hell of changing plugs/wires/cap...ect and now the beast runs like crap? put the old cap back on and it is a little better...any elect. need to be reset? or do I have bad plugs,rotor? any help will be much appreciated as this is my work vehicle...

thanks.....concept.

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Peter Griffin
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