Not Good

Ok, so today I had the APR program (93 oct) flashed on my ecu, it drove pretty great right after i got it. However, i went to go drive it again this evening and BIG problems! It idles ok, but as soon as you go to drive it the check engine light starts flashing. Also the engine is having problems. When you press the accelerator the engine stumbles, and then makes a noise kinda like a machine gun (bad example I know.) I only made it about 20 ft down the road and had to turn around and park it! I'm pretty sketched out, I would bring it somewhere to have it checked out, but i'm afraid it won't make it, or it will seriously damage something. Anyone had this problem? Know anything about why it happened? Any ideas? I don't have any engine codes to give since this happened about 5 mins ago..