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Ok so I have a 2011 passion with only 26,600 it started misfiring really bad and the check engine light turned on. I took it to get it check i got codes P0300 P0301 P0302 P0303 Misfiring on all 3 cylinders. I took it to my mechanic and when he checked the spark plugs were the incorrect ones and the gap was also incorrect and it was burning lean. After replacing them with NGK. The car is still misfiring but not as bad. He said he will test the fuel maybe the last fuel i put on it had something to do with it. But right now i have no idea what else it could be. Any advise would be helpful.

Thanks
 
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