A Couple of Problems.Need Advice...

i have a 2000 silverado z71.theres a couple of noises that are noticable.first,when i give it gas you can hear on the inside this almost like air being sucked through a hole noise.its coming from the passenger side.its only when i give it gas,doesnt matter if heating or ac is on,does the same thing.....second,i can hear a sort of rattle from the drivers side front wheel.its real mello,and when i turn the wheel to the left i feel a roughness and a noise from the power steering,but the fluid level is good,when i turn to the left its smooth,no prblems or noises.any thoughts anyone?????