My 97 has started doing the exact same thing, I have a front mount on mine. I had just put it down to the cold mornings, but these are japanese cars and using an edumakated guess is that it gets a whole lot colder there and it never happened last year. Ill try cleaning my IACV aka high idle valve : ) this weekend and see if it makes a difference.

You deleted your comment saying that it was fixed Robbo... Does this mean it's no longer fixed??

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Signarape!

Cleaned it, problem gone, cheers for all the help guys