i have a 2000 blazer which has been just fine until today i went to go start it and i immediately dies within a sec or 2 . did that twice then i tried to start it again it made a strange clicking noise and turned over but didn't start i was about to give up when i tried it again and it started fine and ran what could this be i only ask because we are a 1 car household will children and we live in the country and i'm worried if my kids get hurt and then my blazer wont start...please any help will be appreciated Thanks

EDIT it only ran for a mile now its at mcdonalds parking lot