Hey how's it going !? Congrats on your 2M views !! Thank you for doing what you do! I don't know what's wrong with my 4 cylinder 2008 Nissan sentra . It drives good for an hour drive but after an hour and a half the rpm suddenly won't go up to 4000rpm. And it makes hissing noise . Is it a bad transmission ? What do you think is causing it ? And how much do you think to repair it ? Thank you again !