Mazda 6 2006 v6 3.0L

Whats wrong with my Mazda 6 2006

Hi Scott my name is Bruno im having a issue with my car its sounding like a grinding /hissing while im driving/when I press on the speed pedal. what do you think can it be the other day I was backing out of the driveway when I put on drive it kind of delayed for a sec. and also I would like to mention that my obdII code reader when I attach it to the car it says that it cant connect to the computer, can you help me out thanks

grinding and hissing are generally different things. But do check for broken motor mounts first, which could move the engine then cause hissing leaks on vacuum lines

ok cool ill take a look at it thanks