yesterday i had stopped at the gas station and put some gas in my car, well soon as i left from there my car started acting like it would die and then rev up to 2000 rpms to 2500 rpms. It does this at an idle and while i am driving. I did a dianostics run on it and i got a code 51 which means fuel system lean. What does that mean exactly?

Could be bad gas or water is gas. Try putting something in your gas tank that helps eliminate water.

ok, thank you sooo much i am tired of driving a bucking car.....lol