So i got a s5 t2. and it wont idle at all. only when its cold it will idle find, then when the engine gets warm the car wants to die unless i have my foot on the gas. i had an s4 and the same thing was going on, but i took the EGR valve off and that solved the idle problem. but if i remember right s5's dont have egr valves (correct me if im wrong). ive done all the tune up things plugs, wires, filter, oil change, and even tighten up the throtel cable. so if anyone has any ideas please let me know!

 

Have you checked for simple things like the idle adjustment screw?
Check out your Variable resistor as well, only if its been altered before.

Check the BAC valve, pull it off and see if its completley sealed off, if it is, you can try turning the allenkeyscrew on the end of it to open it up a little.

You might also be running to rich for some bullshit reason, so check out your TPS and spray some carb cleaner onto your afm hotwire to clean it up.

Not the best advice, but certainly things I would do if that were happening to me.

 

Ya i wana clean my BAC and intercooler. the only problem is i live in Iowa and i have no garage. right now its 20 degrees and snowing so its kinda on a hault right now. and yes i tryed and mess with the idle screw...not really any improvement.