The 16v K-Jet system is really basic, yet quite fiddly at the same time. In other words, its probably something quite simple, but it'll take a lot of patience to find it (unless your lucky and cure it with the first thing you try!!). If I really liked the rest of the car, I wouldn't let it put me off as it SHOULD be a cheap fix, unless your unlucky, e.g. its a fuel pressure related problem which can get expensive to sort out if you need to buy a new pump and start replacing rusty fuel lines. A basic check for fuel delivery IIRC is to drive it on a bypass at 70mph in third, which should expose stuttering/popping if fuel delivery is poor.
To be honest, that cutting out problem is most likely to be an air leak or CO2 setup fault, or a relay issue maybe, but as with any car with a "known" fault, you have to really like the rest of the car to warrant the risk. Afterall, there's plenty of fish in the sea.
