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Question edited for clarity. P codes for DTCs must have upper case P.
All questions need FULL 'year make model'.
White smoke is steam, and this is normal at this time of year and is mentioned on this website a LOT at this time of year. Gasoline has weather in it at molecular level and is burned off as steam.
P0300 unknown random misfire
P0303 Misfire on Cylinder 3
P0304 As above on 4
P0455 Evaporative Emission Control System Leak Detected (gross leak) - check your entire engine bay contents for any type of leak, air conditioner when it's running, coolant, things like that.
P1684 Battery Disconnected Within Last 50 Starts - this is a code that will go away over time
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