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p300, is a generic code for misfires. Could be any of the cylinders or all. When's the last time you had a tune up? Start with the cheap stuff, fuel filter, air filter, and clean the throttle body. If that doesn't clear it up, replace the plugs and wires.
I believe the p300 and p301 codes are emission control codes. Rough idle? Usually changing some emission parts will help. Especially if you have to pass air quality. So i recommend changing the PCV valve. If your car has a lot of miles,you should change EGR valve O2 sensor. These items can be pricey. Your cars computer will adjust itself for these conditions. Eventually,the car will just run poorly though.After you fix it,the codes can be erased at your dealer.
I found on line that the p300 coad is a random missfire in all cylinders and that the last number in a p300 code is the cylinder that is misfiring. Your p302 & p303 would be #2&3 cylinders.
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