I know for a fact a weak battery can cause misfires and other strange running conditions. Good advice sfair about checking the charging system. If the FI light is not comming on probably means you do not have any sensor issues which is a good sign. The service manual does have FI diagnostics which could help narrow down a issue if you had the light comming on. I would suggest getting rid of the old battery.
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2007 VN900 Classic LT (Dragon Theme)
Cobra- Pipes, FI2000, Passenger Floor boards, Engine guard and luggage rack.
Memphis Shade with 9" windshield.
Chrome covers for neck, radiator, Rear brake Master Cylinder, and regulator.
RC Components Nitro Chrome wheels w/ Night Dragon Tires.
Çobra Power Flo breather