hello all, looking for some help. i recently swapped out my carbs. upon start up it ran decent, made idle speed adjustments. anyhow --when you let off the gas it takes a second to return to the set idle rpm. like it hangs at 3 or 4k for maybe a second or 2 before dropping. any ideas on what i need to start with. i am gonna try to synch them myself but wanted to see if i needed to do more internal work first. i did clean the carbs up with cleaner and air before installing them. thanks..