Even driving it moderately 5 km highway and 5 km city, it does not always make the sound by the time I get to work. (mechanics.stackexchange.com)
@Paulster2 Convert to an answer and I'll accept it - cleaned the IAC and throttle body, plus reset the ECU today and after driving about 20 km city it looks like the problem has went away. (mechanics.stackexchange.com)