Hi Carl,
First of all, relax.
Second of all, this is the SC model forum not the GS model forum.
Now on to the question. I have no idea what you mean by the car coming to a standstill. If it is still driveable, take it to your nearest auto parts store and tell them that you have a check engine light and need them to read the code for you. They will ask you model and year of vehicle and grab the appropriate equipment to read your check engine light code. Even if the car is running fine, the light is on, etc. at the time, they will still be able to read the code.
Once you know what the computer says is wrong, it can give us some insight into helping you solve your problem. But I suggest taking it to a dealer or authorized mechanic to do your repairs.