Question about 2004 Chevrolet Malibu

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Runs rough at low rpms. Misfires but goes away at about 2000 rpm.

2004 chevy malibu with a 3.5L engine. Misfires at idle and at low rpm. Once you get above 2500 rpms or higher, it goes away and runs fine. It actually runs alot better when you hammer the accelerator. Thats what made me think that it had a vacuum leak. but I believe i checked it all and is ok. Good compression. Going to check fuel pressure. My OBD 2 won't read the computer and im not sure why. I could take it to autozone and have them scan it. I changed the plugs and wires. Don't know otherwise what's wrong.

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Sounds to me like it could be a Mass Airflow Sensor issue. Or Air fuel mixture problem. Is the harness to the MAF and Trottle control sensors hooked up right? These are just simple solutions that may work. Check all of your fuses as well. One could be blown causeing you DLC not to operate. DLC =DATA LINK CONNECTOR. Find the fuse... read the code.... solve them problem! GOOD LUCK! hope this helps.

Posted on Dec 28, 2008

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I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

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