Contour Enthusiasts Group Archives Forums General Troubleshooting "Back-fire" sound from under driver's feet?

Might try having fuel injectors cleaned. Mine was doing a backfire thing as one of several symptoms. Plugs, wires, fuel filter, and fuel injection cleaning took care of it. I'd pay for real fuel injector cleaning rather than using the stuff you can buy and dump in the gas tank...never got a permanent improvement from that stuff.