I've got a 2003 Dodge Neon SXT, with trouble code P0304. I've replaced wires and

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USMC503

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plugs, what next? The car runs fine and the light comes on periodically and goes off almost at random. Is this common on this year, it only has 62K miles on it.
 
If the check engine light is coming on for the same problem. The only things left are an ignition coil problem, a fuel injector, or low compression problem in that cylinder. Not common that it has a compression problem with that mileage but not unlikely. Coils usually go bad first on those. Check those things first. I've also seen a leaking intake that causes a misfire problem on those cars. Good luck.
 
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