Every now and then my car will backfire from the engine not the exhaust. What could be causing this? What are the remedies? It mainly does it if I am just revving it a little like backing up or pulling forward slowly. Thanks

 

Your signature implies your car is mostly stock, therefore I'd suggest a tune-up (plugs, wires). How does your car run other than the occasional backfire?

 

Actually the car has brand new plugs and wires less than 500 miles ago. Also a new opti and water pump at the same time. Any other ideas?