I have a 2000 jimmy, vortec motor, showing code p0300

2000 GMC JIMMY
105,000 MILES
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DEREK926
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I put on new plugs, wires, cap and rotor,and still runs rough and showing same code, what else could it be?
Jan 11, 2012 at 10:07 PM
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RIVERMIKERAT
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Improperly gapped plugs. Vacuum leak. Bad valve(s). Low compression.
Jan 11, 2012 at 10:10 PM