tranny brake ....need help

well we now have a new battery , and i ran a #4 welding cable for the charging wire, the car never ran so good,..... 14.2 volts every where....but the same thing happened again last night... this time I drove the car... Launch control set at 4200 I left on the second yellow, car jumps like it serious ... but about five feet out it breaks up sounds just like i hit the rev limiter ... but tack was just about 5000. about three dits ( dit dit dit ) and the motor is back on and pulls like a freight train....terrible short time.... 60 ft was 4.60 .. the tires unloaded when the motor faultered and when power came back on the tires went to smoke, i had to back pedal before i lost it...... off the foot brake it did a 1.55 on the next pass....run strong all the way........looks like it is time to call msd... the only thing i have not tried is connecting the carb vents with a vented hose ,,, thats the last option I know of ,,,,possible that fuel is spilling out the vents? well so i was told anyways..........one other option came to mind ...i think i am going to unhook the two step all together , and try a launch off the t brake with the throttle right up against the converter.. that shoud tell me if its fuel or msd box thats bad.............should be a fun ride ....