Hope this helps someone, so here goes.. My car had a problem recently and would die for no reason at all and no codes, it did this for a couple of days until I noticed the lower passenger side hose from the throttle body was disconnected. I reinstalled it then drove the car down the street and thought it was good. I then drove it to work and at a stop light it suddenly over-reved and died blowing the hose off again. So I got it home (limpin) and started diagnosing the problem 'cause the hose was connected to Evap cannister purge valve solenoid and I thought maybe that had something to do with it. So I replaced the solenoid cleaned all the EVAP lines and ran it again and the same result happened.. Next step was to inspect the throttle body and inspect the IAC motor and TAH DAH... Carbon build up was the culprit, by not letting the motor do its job, So I cleaned it reinstalled and now it runs like a champ.