That is up to you and only you. :)
We don't have enough info to give that type of advice? Is it paid for, are you in school, are you working, how much cash do you have for repairs or new car, looking for a new or used car???
My rule of thumb would be if it is paid for and having no issues and you don't WANT a new car keep the one you have. You may end up buying another one with more problems than the one you have?