my car is a 2006 cobalt ls and every time i stop to fast the car will try to shut off and sometimes shut off. I tried to adjust the throttle body but its all computerized. what could be the reason that its doing this?

 

might just be a break booster issue...or just poopy gas

 

remove your TB (carefully) and clean it. Crap builds up on the TB, which makes it harder for the ECM to get a good idle, so upon deceleration, it will bog and occasionally turn off

 

I had a Dodge Daytona that would do this.
It happened after I had the exhaust upgraded.
The shift points that car learned to be optimal were no longer optimal due to the change.

It can also be a change in the car like a leaking vaccuum line or any other upgrade or mod.

The fix was a computer reset, it relearned the optimum shift points on the transmission and AFR.

The car knew to give a little more fuel at a stop so it wouldn't crap out.