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Random misfire codes after changing spark plugs. CAR RUNNING VERY ROUGH

(2002 Infiniti I35)
in Seminole, FL on July 09, 2012
had my sparkplugs changed and was told oil was found in one. had both gaskets replaced and now my car is running HORRIBLE!!!It is sputtering and i am getting only 10 mpg engine codes are P0300, P0223,P1224, P1122. in addition, both the check engine and airbag lights are blinking.
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Popular Answer
of Greg's Orange Auto on July 10, 2012
take back to mech something is def wrong.
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