when i start my chrysler 2007,why is a cloudy of white smoke,smells like sulfix on 2007 Chrysler Sebring

the 02 sensor been replace,an the is still a cloudy of white type smoke coming from tail pipe,smells like sulfix..what can it how to repair

Asked by for the 2007 Chrysler Sebring
Check your coolant level to see if it is low. Sounds like a possible head gasket leak and you are burning antifreeze. This is the white smoke you are seeing.
what can i there an sealer or do i need to rplace the gasket
You can try a sealer but, they usually work only for a short while. Gasket will need replaced for a long term solution.
what is an misfire..po 300
That is a multiple misfire code. The engine is misfiring due to increasing levels of coolant getting through the head gasket and disrupting proper ignition of the fuel/air mix. You need to go to a shop and get a diagnosis and estimate.