I noticed lately when I start my car up it backfires when it starts up. I heard it a couple of times and thought nothing of it. But, now it does it all the time. I can drive it and park it and it will do it. So i figure it is unburnt gas, well it sits all night and fire it up in the morning and it does it too.. Car has no mods is all stock. Anyone else have this issue?? Do i need a PCM tune or what?

 

Hmmmm check your sprak plugs. I'm wondering if it could also be a fuel injector? Is it sputtering or more of a pop? and is it loud?

 

Just take it to the dealer... you are still under warranty and you are bone stock.

 

IT is pretty loud, more of just a pop.

I do get shitty gas mileage i get about 270 miles out of a tank or is that normal? I am city/country driving.

 

just might be your cat,ask them to check your o2 censor aswell

 

It does sound like I have a slight exhaust leak, sounds like it coming around the floorboard on the passenger side.