In the last few months, my wife's 2008 Holden Viva automatic has begun stalling while in drive idling at traffic lights. It has occurred a few times in a row within a few minutes, but at times it might go a week or so without stalling. Once or twice it has also happened while slowing down to make a turn at a roundabout. I have noticed that it has been idling around 850-875 rpm in drive and idling very rough at times usually when it might happen. What can I do to fix this ongoing and very dangerous problem?
It could be a vacuum leak, a split vacuum hose or the like, that's causing the idle mixture to be too lean. It could also be a sensor that's gone on the blink and sending the wrong signals to the computer. You really need to have a mechanic check it for you.
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