Theft key light is on flashing and car will crank but wont continue. .it shuts off quickly. ..why is it doing this ?

The answer to your question can only be found after professional testing is completed. You will need to have your vehicle towed into the shop and have them find the answers to your question. We would be happy to do so for you. Atlanta Car Care 2816 Buford Highway NE., Brookhaven, GA 30329 phone 404-325-0063