Iva had my new fc for a few weeks and since ive owned it its always started up on the first try and idled ROCK SOLID at 750. I drove ti to work today withotu issues and then I just went out on one fo my breaks and had some trouble. It started up, then kinda stubled and jumped back and forth between 250 and 750rpms then just died. I restarted it and same problem so i just held the gas for a few seconds and then it idled fine for the rest of my short trip.

What could have caused this? Should I be worried?