Question about 2000 Chevrolet Impala

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Rough idle code P0300

Car was ok has 112000 so went to do a tune up new wires plugs fuel filter, and air filter. runs real bad now and code P0300 put old stuff back in and still has the same problem

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  • tf8316969 Jan 01, 2009

    the code P0300 is random multi misfire

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Check the fuel pressure when u get a po300 code that means there has been a missfire. if your fuel pressure is low it will cause missfires.

Posted on Mar 08, 2009

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I had the same issue. The problem corrected itself when the airflow sensor was replaced.

Posted on Mar 09, 2009

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I made the mistake of thinking all spark plug wires are the same (a long time ago). The plugs and wires that I would recommend are NGK plugs available at most parts places. Make sure that they are gapped properly (they should be able to tell you the gap at the parts place, or the dealership. Even if they tell you they are pre-gapped always check the gap and gap them if needed to the appropriate level. NAPA autoparts has premium spark plug wires Belden MAXX that are great for most applications. I put inexpensive plugs/wires in the past and paid the price. Depending on how long the condition has existed you may or may not also have an ignition coil (or 2) that may have gone bad. These are relatively easy to switch out (they are usually on top of the motor somewhere near the spark plugs). Once you have put the new plugs/wires (if that is what you decide to do) then disconnect the battery for a while and drive it to re-set the computer. Hope this helps

Posted on Feb 16, 2009

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Did you upgrade spark plugs to a multispark or performance plug???? if so go and purchase original plug that vehicle calls for... This is what i would do, after all is back with original stuff including plugs I would disconnect the battery for a couple minutes and then try and start again. If same conditions and you get same code replace pressure regulator... Make sure you find out this is the code before purchase . I am almost positive that the code you have is for the fuel pressure regulator...Good Luck

Posted on Jan 01, 2009

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Where is the Mass Air Flow Sensor located on a 2000 Impala and how do you replace it?

Posted on Jun 13, 2011

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Www.2carpros.com/kpages/diagnostic_trouble_codes.htm

Posted on Jan 13, 2009

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