Recentl bought a 07 gsxr 600 with an Coffman exhaust on it. Could tell the air/fuel ratios were off, but I went to start it this morning and it cranked over and idled extremely rough and then died. When I tried to crank it over again, it would sputter and would not crank over. It seems like a fueling issue but I’m not sure. Does anyone have any idea what it may be??