When my car was brand-new I had the same feeling you did. I used momentum to get my car into the parking space as it was snowing, and then I decided to be sure I could get back out. The car was stuck and the ABS light was on. I thought maybe I broke something under the car. Anyway, I figure forget about the car being stuck let's get the ABS lamp off. Turned off the car, waited 5 minutes, it was still there. Came back the next morning and it was still on!!!

The car had to reach a certain speed, like 20-25 mph and then the lamp went to sleep like a little baby. I think the lamp stays on because due to the wheelspin the sensors have lost sense of the wheel position and regains it when you drive. As for the rough idle I don't think just flooring it would cause that. Let us know how you make out.

 

Sure enough {haven behold hehe} the ABS light is gone. All I did was take it out on a little ride and about 10 seconds in the light shut off,come to think of it my Max did the same think when I peeled out in the snow. As for the idle it may be because I just switched my denso plugs from my max and they looked a little oil fould so maybe thats the problem hmmm,I will put some brand new ones in soon. The idle is hardly noticable actual I was just freakin out last night haha all it does is when you stark the car up{cold} after sitting for about 10 minutes it will drop down to like 500RPM's for a split second every couple of minutes or so and the car vibrates a little.