My 2004 Mustang v6 lost everything yesterday. The battery died at work, so I got a jump then went to pick up another car that we had in the shop. I needed another jump at the gas station, after we drove away the car started accelerating and slowing down compulsively, in sync with all the gauges and lights shuuting on and off and revving up and dropping. Could this all possibly be an effect from just a battery? Could this be a bad alternator? A regulator? PLEASE HELP before i get too over my head in mechanical bills!