For some reason when my 2006, 2.4 SS is ideling. The rpm goes down to 800 for a split second and then jumps to 900 and sits there until I rev it and it does the same thing is this normal...

 

I forgot to say that when the break is being pumped the rpm goes up aswell. Any suggesting on what could be causing this issue????

 

Mine had the same thing and i have a 2.4L 2007 but it ended up being my floor mats a piece was pulling down on my gas. I caught it the third time it did it and fixed it.

 

How many miles do u have on it?

 

mine still does that NA and boosted, still cant find what does it, normally happens when im coming to a stop. ie: red light, stop sign, or i just step on the car and brake almost immediately. rpm will go to 1500-1900

 

you could try cleaning your throttle body

 

try turning off your A/C thats the only time it happens to my 2.2 L61

 

Hmmmm no one has found a solution to his problem yet?

 

I got 110,000 miles on it its a 2006 ss 2.4.
I tried fuel injector cleaners and it reduced it some what. But the issue continues.

 

clean/change throttlebody if the car is stock, check cat

 

I will be the third to chime in with throttle body and even include one of the links that comes up if you search on here for idle problems.
https://www.cobaltss.net/forums/2-0l...inally-116051/
Search is your friend. Balts have been around for quite a while so pretty well any problem you have will have a thread in here somewhere.

 

i vote for throttle body also...only thing is depending on how many miles you have on it. i cleaned mine at 65000 and later on in the day it throw code for a high idel. to fix this you can disconnect your battery over night to reset the pcm. or just keep driving and it will relearn the idel on it's own. will take a few days tho.

 

i changed mine and was still the same....

 

Mine just started doing this. I checked the floor mats and they were moved more than far enough back. First it was with the A/C on, I shut it off thinking it was the problem. Sure enough, 2 minutes later it happened again!