I know so little about cars, it's irritating, but I need some help. I was driving quite normally and on my dash I get warning lights for my ABS and traction control. I read somewhere that it's still driveable, so I drive it for a few more days. All of the sudden, a few days ago I try accelerating and it barely makes it past 40mph and I get a loud hissing coming from under the hood. I have no idea what the **** this means, but I haven't driven it since. Does anyone have any idea what the problem may be? I scheduled an appointment to have it checked with a Chevy dealership because I have a good warranty, but they can't see me for two weeks, and I need a car.