Shudders and stalls every few months

Check the computer for codes. It could be a Crank Sensor or many other things, such as a power relay etc, etc. Also check your idle system.

I am having this exact same problem. Also I find that when I go to accelerate from 0 it is not shifting gears properly from the 1st to 2nd gears, once I get going it is fine. Mine shakes and stalls at red lights and in the morning sometimes when I am reversing.