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ex engine misfire

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Old Apr 23, 2011
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ex engine misfire
need some help. my 2003 civic ex has started to run rough pulled codes only codes are p300 thru p304 it seems to misfire under low rpm(1500 rpm's and under) any common failures? where do I start? thanks for the help
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Old Apr 23, 2011
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Re: ex engine misfire
spark plugs?
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Old Apr 23, 2011
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Re: ex engine misfire
I will pull the plugs and check the coils today but it doesn't seem logical that all 4 plugs would go bad at the same time to cause all the cylinders to misfire I was thinking a sensor problem or fuel pressure issue but I will start with the basics first
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Old Apr 23, 2011
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Re: ex engine misfire
oh, good, i was not sure how much you knew of cars.

try to search the codes in the site and in here:
http://www.obd-codes.com/trouble_codes/honda/
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Old Apr 25, 2011
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Re: ex engine misfire
I had that happen to me it was a the Oxygen Sensor
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