Does anyone know what was the culprit for this one ?
I have something that from the description sounds very similar.
in my case, the following parts were swapped just a year ago (when diagnosing a different issue, which turned to be a vacum leak)
MAP
lambda
TPS
plugs
coils
leads
fuel pump
vacum pipe from MAP to engine
Ive also checked the resistance across the CTS that is at the top of the thermostat, and it is changing as the coolant gets hotter, but i dont know if the readings are within spec (because i didnt know the temperature, neither the spec)
just to re-iterate, in my case.
when cold
car seems to be ok, both idle as well as revving the engine and theres power delivery.
when hot
idle is ok. but engine stalls if i open the throtle.
the strange thing about it is that just a couple of weeks ago. i drove it for a 40 mile return trip and it didnt miss a beat. admitedly it was mostly motorway driving, but the next time it started it barely made it out of the housing estate before it was turned around.