The other morning when I went out to start my car, it was only running on 3 cylinders. I let it set for a few hours and when I tried to start it again, it wouldn't fire. I pulled the plugs and they seemed to be fine. The car only has 27k on it. Is it possible that a coil could be bad already?

 

A bad coil would not prevent the car from starting. Is it cranking at all? Check your battery. How do you know it was only running on 3 cyl?