new banshee owner needs some advise/help

[bns_blueticks]

Hey I just got a 2002 banshee and it already has these upgrades It has FMF Gold Series Fatty pipes,FMF boost bottle,they said it had been jetted out,I was also told that the guy he got it from had built up the motor as well,and it has wide nerf like foot bars.It starts good and will haul ass but it wil not idle at all i tried adjusting the air screws but it made no differance in the idling,I have never owned one before so im new to these monster's,and other than the idleing what else can i do to make it faster without breaking the bank lol?