I have a 99 pontiac firebird and last week one night the check gages light and the ABS INOP light both came on. I think the check gages was lightwas on for the battery because that one was was waving back and forth alot. Nothing happened that night I didn't notice anything wrong at all. Then the next morning it wouldn't start. I jumpstarted it later on in the day and it had been working fine until today. Both lights came back on and it started sputtering for about a quarter of a mile. I didn't have to much control over it. It seemed like when I went upwards on hill or whatever it lost all power. I took it into an auto repair place and they thought it was something with the alternator so they fixed that but on my way home it broke down again. I am sorry I don't know anything about cars so any advice would be greatly appreciated. Thank You.