hi i have a k reg 318is bmw with and irratic ideling problem, when i first start the car it is hunting (ideling) quite a lot and sounds terrible however once the car has warmed up this problem starts can anyone help please i have had it put on a diagnostic machine and pulled up a problem with my crank vent valve but after looking through my haynes manuel i cannot find where this is situted to and i can not find a detailed enough pic on line with the necessary info, sorry if i sound a bit vague but i havent ever posted on sites like this b4 so not to sure what hapens next thanks