hey guys quick question. when i start my car up and let it idle its perfectly fine but when i put the car into gear and get around 1500 rpms and up theres a ticking/hissing noise that i hear from the pass side front of the car. the ticking/hissing follows the rpms almost exactly. But when im parked and i rev it theres no noise at all. i dunno exactly where its comming from, could it be an exhaust leak? if it was a exhuast leak or a valve would it always make the noise at any rpm? i dunno what to do.