I have a new house with a toilet on the second floor that gurgles when flushed. The builder replaced the toilet but, the issue still persists. I beleive it affects the flushing process because I have to plunge that toilet at least every other week.The vent exits the roof above this bathroom so I am not sure if it is a venting issue. I am looking for any possible insight to this problem. After August it will no longer be the builders issue. Thanks Kevin