hi all, i have this problem with my S5 turbo. Every time i rev the car over 6k and let go off the pedal the idle doesnt stay steady and bounces down then the car just stalls.

the car is stock as a rock ^^.

 

Clarify what you are talking about, you are pretty vague in your description. Are you saying that after high rpms the idle is wierd at, say a stoplight? Are you saying that after high rpms the car dies at a stop?

 

yes at a stop when the cars not in gear, but if i keep the revs up it eventually goes back to normal.

 

check the AFM, and the BAC for sure.

 

make sure you don't have any boost/vacume leaks anywhere