What are the causes for recurrent chills with fever. Actually episodic and does stress can be a cause?

Many possible. If you're having episodic fever & chills, this needs to be evaluated by your primary care physician. Stress would not be my first guess on this one, but i'd be concerned about an ongoing or recurrent infection. Responses to some infectious agents behave this way.
Stress usually not. More info needed. How often? How high is temperature? Only one spike or several per episode? Chills or shaking chills?