Trx300 Fourtrax Question

I have a 91 Forutrax just rebuilt the carb. Now it idles high in neutral, lunges forward when I shift into first but idles fine. Good throttle and everything. What would cause this??

Thanks,

Have you tried to turn the idle screw out?

Like what speedfreek said... turn the idle screw out, but only turn it out about 1/4 of a turn at a time.