Question about 2003 Jeep Liberty

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03 Jeep Liberty random misfire

:( My Liberty is throwing codes for 'random misfire. Changed the spark plugs and fuel filter. Still messed up. It will run pretty good between 40 - 60 MPH but rough and will 'jump' at lower speeds and after 60 it shimmies. Any suggestions

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Try checking your ignition coils and also the power wires to them!!Hopefully this helps....

Posted on Jul 15, 2009

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Posted on Jan 02, 2017

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CODES P0300, P1128


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Jeep liberty code po300


po300 is Random/Multiple Cylinder Misfire Detected.This means the PCM sees misfires on more than one cylinder,so it's probably a fuel issue.You might have a bad fuel pump(bearings are binding,causing low fuel volume).It could be the in-tank filter is plugged up,or maybe the in-line filter.Start with the easiest-the in-line filter.

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I have a 06 Mercedes c230 sport and it's throwing code p300 which is a random misfire and idle is going up to like 2 and then will come back down I've replaced the spark plugs air filter oil still running...


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