Many many things about timing belt replacement
You have option to drive your car with these problems, but should set an appointment, however, it is not suggested to drive your car for days or moths. The rhythmic check engine light is more dangerous and indicate about the damage of car parts. While driving if you see the check engine light blinking, there is no need to stop it in the middle of the road, and think with your head down, what will happen next?. However, you should pull over and turn off the engine. Now give your car some time to cool down and then turn it back on.