Panda awkward cold starting

Hi all,
Having a few problems with the wifes Panda Selecta '91.
Fixed the auto box problems, was a case of simply taking the switch unit off the selector lever, opening it up and cleaning off all the contacts.
The clutch doesn't completely disengage when stopped but a small push switch solved that.
Anyway.
When starting from cold, pull the choke out all the way, start. Engine runs fine but then after a few seconds starts to "chug" feels like a washing machine in the engine bay (probably not far wrong), anyway, car stalls and you have to push the choke all the way in, push the accelerator all the way down and turn it over for up to around 30 seconds to get it to start again.
Once it's warmed up a bit, it runs fine.
Any ideas?
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