I have an 06 g35x sedan and I'm hearing a hissing sound when I accelerate and sometimes get a smell of disgusting odor when accelerating any know what's going on could it be the brakes I don't know anything about cars lol

 

There is a snake in your car and when you accelerate it hissed and *****.

 

^+1

 

My guess would be a cracked vacuum line. Or a coolant line, or a snake.....