misfiring badly

Hi all, my beloved K11 1.3 SLX recently started misfiring badly. Any suggestions greatly appreciated!

- It idles really rough and dies after idling for about 5-15 seconds
- It's really rough when cruising at steady speed
- It's OK when accelerating
- There's a smell of unburnt petrol from the exhaust
- Pulling one plug lead at a time makes no difference
- Compression test is good on all cylinders
- Computer shows no error messages
 
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