carb issue

[rustycat2007]

Hello I am new to the forum and amhaving a carb issue with my 07 GZ. Any input is appreciated. I bought my bike used from a dealer in April of 12 it ran fine through when i got parked for the winter. my mistake. i have replaced all the rubber o-rings in the carb except the one on the idle adjustment as i didnt want to mess with the adjustment. the bike is a littlie hard to start requiring a bit of throttle. once started and warmed up the bike does not consistantly idle. Sometime it revs up and will not come back down. When riding as you apply throttle it pops and misfires, loping until you reach about 50mph. Once at this speed it clears up for the most part. The bike sat for approximately three months. I have gone through the carb aproximately five times and it is very clean inside. All of the jets are very clean. Any ideas