exhaust spitting gas.

exhaust is spitting gas. I don’t know if it’s been doing it, but I just noticed it today while I was letting my car idle after resetting the ECU. car gets bad gas mileage in the first place. I searched butr couldn’t find anything helpful. any suggestions?

Are you sure its gas? Its normal to spit some water with carbon buildup when its idling. If you search for this its been discussed before. Mine has always spit some black water if i let it warm up in one place.

if it is really gas, then your o2 sensor may be bunk or a busted fuel injector, it would have to be running rich by a ways to do that