Question about 2004 Chevrolet Malibu

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Runs rough at idle and low rpm. misfires. gets better @ high rpm

2004 Chevy Malibu with a 3.5L engine. Runs rough or misfires at idle. Until about 2500 rpm or higher and then it quits. It actually runs better when you mash the accelerator. I thought it was avacuum leak bugt I checked it and its not the problem. Changed plugs and wires. Checked compression. Going to check fuel pressure. I found a sensor that the haynes manual did not label. It has a threaded plastic port on it but I can't find out if anything goes to it. It looks like it might be an air temperature sensor but not sure. Don't know the code cuz my obd 2 scanner won't read it.?

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  • tupac61389 Jan 04, 2009

    i have a 96 eagle talon it misfires at idle a low rpm but gets better at about 3000 3500

  • hutchinson_j Feb 19, 2009

    check enigne light is always on but flashes when you accelertate idles ruff until about 2500 RPM then smoothes out still has power just idles ruff, Changed the plugs and wires hook up a ODB scanner to it and it said Cyl#5 misfire could this be my coil or a fuel injector maybe Please help this is my wifes car and we just had a baby.



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Sounds to me you have a emissions problem check your EGR valve and MAP senser

Posted on Jan 16, 2009


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I have a 98 Malibu when I turn it over it runs rough then dies

It can be issue with IAC( idle air control valve) causing the problem.

There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

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

Click the link below:-----

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These details will help.


Dec 07, 2012 | Cars & Trucks

1 Answer

96 chevy s10 ss runs rough misfires no engine codes

I am thinking it is your distributor. I had this happen just a few weeks ago. Check with local junkyards as I found a used(almost brand new) distrubutor for 100.00 opposed to almost 300.00 new. Same exact problem and also changed each thing you listed prior to finding out it was my distrubutor. My truck runs like it did before the issues started.

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1 Answer

2003 chevy malibu 3.1 shuts off and wont stay on

Check the idle air control valve for carbon buildup. Also check for a vacuum leak.
High idle rough idle Ricks Free Auto Repair Advice

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1 Answer


For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? idles rough?
--------------runs lean and idles rough?
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------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?
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Nissan Pathfinder Backfires?
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1 Answer

I have 1999 chevy malibu and it runs hot while in idle and the rpm is higher than expected

For the hot while in idle problem, I would look into whether the thermostat is stuck closed, the coolant level is low, or the fans are not turning on.

For the high rpm, I would look for an engine code relating to iacv (idle air control valve) or another cause as indicated by a code.

Good luck ont his repair.

Oct 18, 2010 | Chevrolet Malibu Cars & Trucks

1 Answer

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

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.

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2 Answers

87 Supra idles rough and dies out

check timing and set idle to 650rpm

Dec 15, 2008 | 1987 Toyota Supra

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