I have a 1998 Honda Civic with CVT transmission. My problem is while driving it hunts, the RPM needle goes up and down. What can I do to solve this problem.

The information in this link should solve your problem:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-7.html#post842969