Went on a trip, I have a 2017 Nissan Sentra SV. There was a very bad smell of something burning while going up a pretty steep hill. I pulled over and popped the hood. I did a quick inspection and nothing there was a small plastic hose in the engine. I'm not sure what it is or if it was the cause of the smell. There definitely was a performance issue and I was a bit concerned that we wouldn't make it up. I'm at about 78k. How would I go by trying to identify and possible fix? Thanks.