Sooo I have had this issue awhile and being searching for a answer....so far i have gotten no where. When coming to a stop (in and out of gear) my idle bounces and some time stalls out esp. when I am in gear. It doesnt usually stall if i am out of gear. I have had a few tunes on it seeing if the issue would be resolved but it hasnt yet. So that makes me believe its something mechanical. It usually gets worse the longer i drive the car. I figure maybe i have a vaccum leak somewhere??? If anyone could help me out I would much appreciate it.

Mods Include...2.7" w/ 60lbers, header/DP/catback, intake, front mount he

 

my idles bounce around a lot too. not sure what it is

 

My idle bounces as well, but I don't stall. Hmm. Wish I knew more about cars to help out!!

 

my cobalt does it and it keeps getting worse as time goes on...mods are gm stage 2 with 2.9 pulley.

 

well i guess im not the only one lol

new tunes dont seem to help either

 

mine would kinda do the same thing, and if i gave it over 50% throttle it would go into limp mode. turned out that the throttle body was bad and would lock up anything over 50% throttle. replaced the TB and all probs went away.

 

hmmm i wonder if i should change gaskets...

 

clean the TB

 

whats your idle set at.

 

yah mine does the same thing..went to park the other day and idle drops below one bouncing around same thing happens when i start the car sometimes.... Not sure what it is but i just wait till it cuts off by itself which it doesnt do

 

MY CAR DOES IT TOO! If you find out lemme know? basically i got the same mods as you.
I have had the bps and maf replaced with new GM parts and it still acts exactly the same.

 

its like around 800 something

 

it's in the fuel map itself.

i have 60's. my car idles perfect at 750. no idle bouncing or anything.

 

I thought about that too AREA. Trust me his and my idle are fine, Its not like that, its just weird. ? ? ? your car doesnt? I think maybe its the colder plugs for my car. not sure? And dont say its the GM tune AREA! LOL. ( it may be?)

 

i know what it is. see above.

 

so what should I change in the fuel map?

and I should lower the idle?

 

AREA what 60s are you runnin? I think I might want to bump mine up just for peace of mind, and i know i could squeeze out more hp with them and a good tune.

 

depends if you have the time to redo it all. along with getting PE back in line and such. what year is your car?

lucky. msd injectors. what every one else runs.

 

I have plenty of time haha.

its an 05

 

i have a map for ya to use.

 

sweet, i sent you a pm

changed the maps....it is a little better but still is bouncy

 

drive it for a couple days if it doesn't work itself out. i have another map

 

it sounds like area has it covered, my car did the same thing for awhile till the guy that tunes my car had my car tweeked just right

 

I will have to drive it around this weekend then. I will let you know

Thanks again

 

Car still has the same issues....any other ideas?