start problems and white smoke smell like gas \???

Run some good, probably pretty expensive injector cleaner through there. Then go from there.

All cars start with a rich fuel mixture. They run for the first minute in a open loop condition which means that the O2 sensors are not controlling the fuel mixture. --- If you are smelling gasoline much worse than when other cars start, you may have a fuel injector leaking and filling a cylinder overnight.

That is a good possibility as well. My thoughts were dirty injectors in general, not atomizing fuel and bad incomplete combustion.

Thanks guys I'm go to try to clean the fuel injectors but I still have miss fire in all the pistons

Do not kno w

Where are. Fuel injectors located in a 1992 nissan sentra