I would recommend to use b-12 or some other type of throttle body cleaner, and while the engine is idleing, you carefully spray the cleaner on the outside in the location of the seals. If you experience increase in idle you have a leak. This stuff is flamable so be careful. go slowly and wear eye protection cause that fan can blow it in your eyes, also spray and wait, just a little at a time in each seal area. This will give you a good idea if you have any leaks and it will clean it too! Good luck!
Regards,
Brian