i have a problem and i stil havent fixed it well my camaro dows this when i hold the gas in low rpms it seems like it is going to turn off and sometimes it turns off what it does its like the rpms fo grom 1500 to 1000 up and down while holding the gas i dont know what it could be and lso while im backing up to park i cant accelerate my car slow because it will die i have to do it hard and even sometimes it still dies like i think it could probably be the O2 ensor but i dont know what can it be any ideas please thanks.