scenic 1 2.0 idol issue

first off thanks for any assistance you may be able to give regarding this issue,

i have a 2003 scenic 1 2.0 petrol, the issue is it wont start without reving it to around 2000 rpm and holding it for a few seconds other than that the car just stalls out and takes about 20 seconds of turning the...scenic 1 2.0 idol issue

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