Trouble Code: P0304
Cylinder 4 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system.
Base engine mechanical fault that affects only Cylinder 4.
Fuel delivery component fault that affects only Cylinder 4 (i.e., a contaminated, dirty or sticking fuel injector).
Ignition system problem (coil or plug) that affects Cylinder 4 .This is what is listed for your code.
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine
Misfire codes?
http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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Misfire
on cylinder 4?
http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html
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Oil on spark plugs and car misfires?
http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html
----------This will help.Thanks.
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