Your idle rpm's ar low take it up a liittle bit maybe 800 rpm at idle speed, how much is it at idle speed or it has a vacuum leak
start the car smash the break pedal, play with it up and down. If u hear the rpm's going up and down the master cylinder might have a leak, this working with vacuum and sometimes this affects at idle, try and tell me, have u replaced you fuel filter
maybe your fuel filter is clogged, try replacing it, they are not so expensive and u can changed it every 6 months
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With the Malibu I'm not able to ajust. It has always ran at about 700 rpms.
They did not find a vacuum leak.
But why would it go back to normal in nutral if it had a vacuum leak?
I had the throttle position sensor changed two weeks ago. But with the Malibu it does not offer many way to make ajustments. Everything is control by the computer. Can it be defective?
I'll try and let you kno... I replaced the fuel filter less than a year ago.
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