Any ideas to why my car is running realy, realy, rich? When I run car for a little then remove spark plugs, they're soaked with gas! Car has no power. I have checked voltage on top O2 sensor, it swings from 0 to .9 vdc spending more time at the high end than the low. Car will also backfire. Cat is getting realy hot! Probably because of all the unburned fuel.