After replacing the battery of a toyota yaris 2007, I started the car and the motor startet , but wont stay or fails to keep on. It went off

yeah me too have same problem so i tried to ignore it & keep running after a day...it returns to normal...

Another trick for that is 1- disconnect the negative battery contact 2 - take off the air filter and the hose and hard rubber, disconnect all sensors 3 - with a rag and WD40 clean the carburetor inside, try to clean all the dark deposit. 4 - put everything together connect the battery back and crank the engine 5 - leave it on for a few minutes Eventually the car will regulate again the rpm from 1200 to 900

I don’t ever have that problem with my Yaris.