I have had some shutter during cold weather morning starts. It may be more to the Atkins Cycle engine designed to get high gas mileage rather than it being a real problem.

I do this sequence. (2/3 seconds each) Press the brake then the power button. When the READY light shows I place it in drive or reverse. I let it roll for about 8 to 10 feet then the engine starts. Doing that I have never had a shutter.

I also found if I place my foot on the brake for a half minute. Then press the power button, the ice starts right away. I have had some shutters if the car is not in gear and rolling when it starts like I mentioned earlier.