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Discussion Starter #1 (Edited by Moderator)
2012 Malibu 2.4L 95,000 miles

My cars been running terrible at idle, the vehicle shakes like a rocket ship and is even worse when the AC is turned on. I can literally feel it sputtering when I'm at a stop. Once accelerated it runs fine, no lag or throttle delay. No codes have been thrown of any sort. Just today, upon start up it does a high rev then idles at about 750-800 rpms. I'm on a budget and can't afford to take it in.

I changed the spark plugs
Ignition Coils
cleaned the throttle body
Cleaned MAF sensor
Changed air filter
Changed oil
I've run two tanks with injector cleaner
* Still idles like garbage

I did notice small amount oil in the intake from the PCV line, enough that the throttle body ate some of it . I thought maybe the PCV Valve failed but this model dosnt even have a valve from what I read and I couldn't find one.

Any input would helpful at this point, thank you!

2011 Malibu LTZ 3.6L V6 Red Jewel Tintcoat
17,987 Posts
It almost sounds like a bad plug or coil, but since those were changed, I'd start looking at the wiring to the coils and/or injectors.

But, step 1 is to get the codes read. When you do, come back and share them as they might lend more credence to my idea above, or totally blow it out of the water.

Premium Member
1,557 Posts
First check for a vacuum leak every where. Hoses, any loose bolts on T body and manifold, etc. . Then I would suspect the MAF is probably bad. Mine acted up for a while until it finally set a code. Unless you can read the frequency it's running at you'll never know.
If engine harness was bad it would set a misfire code and not just have a bad idle but miss all the time.
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