2002 hayabusa, 315 miles. Bike has been hard to start, run for a few seconds then die...run then die...then eventually stay running. Can ride it, just slow acceleration. So I started checking the injectors and while the bike is running...started unplugging them. No change at all when I unplugged the 2 outside injectors...but when I pulled either of the 2 center injectors, the bike stalled. Decided to pull the plugs and 2 are clean and 2 look normal. Checked power going to the injectors and all light up. What should I do next? Any help is appreciated, thanks!