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2019 1500 Bighorn 5.7L V8 Hemi misfiring after installing subs

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Ffmcleod

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I just got subwoofers installed about 2 weeks ago. 2 12’s 800W a piece, and a 1200 W amp. Yesterday morning it started misfiring. The 3rd cylinder. I was wondering if that could have anything to do with it or if it’s likely something else? Less than 70k miles. Error Code P0303 and a pending P0300
 

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