Originally Posted by Mike_72
I thought the DBW motors don't have an IAC valve, I thought they just used the throttle plate.
Without an IAC valve.....the PCM can't adjust the idle quickly. You're probably starting the engine and then its struggling to stay alive for that brief period because all thats feeding the engine with air is the small hole in the TB blade, if it even has that hole in it.
The IAC acts very fast to feed the engine air and take it away when throttle is given.