mondeo won't idle when warm

I have a mondeo 1.8lx 1993.
The car starts and idles fine from cold and also drives fine whilst warm. However, when i turn it off (engine warm) and restrt it after
say, 5 minutes the car stalls and won't idle at all. If i drive off and continue to drive for say 200meters its fine, no stalling and it will idle!
Anyone know what the hell is going on?
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