Ok so my car has never given me any trouble and i just changed the oil 2 days ago, and has been running great all day today. But about an hour ago i went out and when i started it it had a really rough idle and acted like it wanted to die, and i could smell somithing, like some kind of fluid. and when i am driving and i let of the gas it makes a really loud poping noise, (it has always made popping noise when i let of just really quitley) but now there really loud popping noises. Besides all of this it runs great and theres nothing else and acts fine, theres no check engine light or any other warning lights. Anybody know y it just started doing this? Thanks.

 

anyone?