my s14a is stage 3, i just put new battery full service etc, was ok for few days, and now the car was running today, switched it off, 5 minutes later i tried to start it and battery totally dead? its a new battery? Then we put jumop leads on it and it started, but after few minutes started to misfire and wont rev over 2500 and the airbag/abs lights came on and eventuallly dropped all the revs and cut off, when to start again and its just clicking with no lights on dash? Put a tester on battery its showing 12 volts? any help would be appreciated