I suppose that's possible, but I would wonder why it would run at all. However, I'm far from an expert.
When you first start it, can you rev the engine before it stalls?
You've probably got air in the cooling system. I don't know if there's any information on the website about how to bleed the air out of the system. There's a bleeder screw somewhere on the engine near the thermostat that needs to be removed while adding coolant. Another way is to elevate the front end to make any trapped air come to the radiator. You may want to do a search here on this site, or the Internet.
Sorry I couldn't help more.