Ok guys I need some help. I've just installed a full system, PCIII Usb, and a custom map from a local shope here. Even with the custom map It shutters like it's to rich between 3500 and 4500 RPM. Has anyone else had this problem. He worked on this for quite a while and he leaned, made it rich and it made no difference. I know you are saying you never ride the bike at that low of a RPM but I do because when I'm on the Highway in 6th gear it kinda hovers around there. It's just nerv racking. The power curve is sweet and it pulls hard all the way up to the redline. What's the cause of this. If you have a map that great down low please post up so I can compare and get some direction on this.Thanks in advance.