hi there i have a similar problem with my 2004 renault scenic. I ahve had the AA out to us 3 times when it refused to start after cutting out and they said the diagnostic showed nothing!!! I find it worse when the engine gets warm like after iddling or on a warm day. Evetually a garage seemed to think it was the tdc sensor or the ignition coils. It is going in for repair next week. Hope this helps
Julie
June 2010
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