Thanks Rob, I'll have a look at it on the weekend. I've done about 30km with the problem and no check engine light yet. I'm hoping it's a vacuum hose because I started it cold last night and it ran fine, but once the engine bay temp got up after a couple of minutes the problem started again. Makes me think the hose is expanding with the heat, thereby opening up the leak and explains the symptoms. Thanks again for your help.
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