engine problems need help

[hockeypimp5123]

I have a 1990 240sx and its having some engine problems. I had left it in the street yesterday and started it to pull it into the driveway today. It started spewing white somke out of the muffler and spraying blackish gassmelling stuff everywhere. I left it sitting out in the street and noticed that the blackish oil/gas stuff was gathering under my engine also. Now its running really rough.It shakes the whole car and if it idles at higher rpms it can kinda beat it out. Im not sure what it could be and need help.

[neverlift]

try unplugging your o2 sensor,if it clears up top it would make sense seeing that is an area that the o2 is unused.

[hockeypimp5123]

Where is the o2 sensor located at?

[neverlift]

please dont take this wrong but you need to download the fsm for your car. It will gain you the ability to not need to ask such a question.http://www.zeroyon.com/index/content/view/24/47

this should give you all you need to know