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What else could P0300 mean after replacing spark pluggs?

(1999 Chevrolet S10)
in Cardington, OH on September 22, 2009
check engine light came on, trouble accelerating, engine shakes and sounds like its going to stall out when stopped.Also engine sounds muffled, pulled up a code P0300 for multiple miss fire. Any solutions hearing these symptoms?
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Popular Answer
on September 22, 2009
Did this code appear after replacing the plugs?
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