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So I had to check engine light come on when checked with a diagnostic machine it read p0303 which was cylinder 3 misfire so I changed the module and the spark plug and it is still misfiring runs rough idles really low anyone have any idea what else could be wrong that's the only code that it sends
 

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What year? How many miles? How old is your battery? How was it running before this happened?
 

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2011 Nissan Murano LE AWD
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In addition to the previous questions, what is the "module" you replaced? The ignition coil for cylinder #3? Also, there should be freeze frame data for that code--post it here.
 
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