You can get a clicking noise from the dampener if does not increase with rpm, also you can get a click from purge control valve when engine is cold on light throttle . these should both be inspected to know for sure , Thanks let me know if you have more questions, ROY!
It is hard to tell noises on line, but what you have told me it sounds like a fuel dampener , there are no special tool to change it. The purge valve will only do it cold . I hope this helps Thank you , ROY!