To clean it the right way you need to remove it, so yes you will have to get a new gasket. When I did mine I pulled it off and took out the sensors and the IAC. Then I put it in the carbereutor cleaner barrel for about an hour. If you dont have access to that then you can just spray it down really well with carb cleaner. You should also carefully clean up the IAC and then put it all back together and re-install it.
how to clean throttle body
