2007 Suzuki Reno Engine stuble then loss of power

On the way home today, engine stumbled twice. I down shifted, thinking it might just be bad gas,(since no warning lights came on) then shifted back up. Engine stumbled twice more, then lost power. Coasted car to a parking lot. Now car will not start. Tried jump starting it, but to no avail. Starter just whirs when turning the key to start. Not sure if one issue has something to do with the other.

Could this be a timing belt issue? Or is it maybe an ignition module issue? Battery also seemed low, and would get stronger when charging it from another car.

Thanks