Rotten Egg smell

Hydrogen Sulfide---this usually shows up with BAD GAS~ this smell will disappear when you use a premium brand~ good luck...good catch on the GROUND....most people ignore the ground, but this one increasingly becomes clobbered by high-amperage repeated dis-similar metals exchanging 300 or more cold starting amps~

I forgot to say my check engine light has been on for a long time. When it first came on I had it checked and came back with the o2 sensor. I was told I didn't need to worry about it but now I'm wondering... Is it still safe to drive?

It's the battery discharging acid fumes. Basically one or all the cell's have fell too short on water and the alternator is boiling the acid into a gas thus the rooton egg smell

Hello, I have a 2007 camry le 4cy. Last couple of years the car runs rough when starting. Usually on cool mornings then runs fine. My wife will be on the interstate running 65, the loses power to around 45 mph. I changed the plugs and wires earlier this year. Changed the air filter, cleaned the sensor right out of the air filter. Put the catalytic converter cleaner couple times this year. It still does it ever so often. More than we want. Anyone have a answer. What do I do. Thanks lance.