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Q: service engine soon light on on 2005 Mitsubishi Lancer

Service engine soon light is on and I judst bought the car. I had the code read at jiffy lube and the code was po 304
the car was hesitating and running with less power. I t is a manual trans. What does this code mean?
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number 4 cylinder is missfiring. it could be a plug, coil or injector. needs to be checked out for a proper diag and a bid for repair.

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