HELP!--A4 engine sputter--HELP!

So I start my car tonight, and get a quarter mile from home when my car starts sputtering, and its shaking the whole car...but only when I'm not moving at all, or when I'm accelerating. When i'm just coasting, everything is fine. At first I thought it might have been some neighbor delinquent that had put something in my exhaust, but that wasn't it...what's the problem here?

My car is a 2003 A4 1.8T automatic, about 51K miles. Please help!

Check for codes.

Got it taken care of...it was a bad #3 coil, went to Audi dealer, they took care of it--no charge!