nismospd20

alright heres my problem i have a 93 fd and the other day i was driving and it stalled out of nowhere.seen that the oil was low so i get the oil changed and the car started up fine and then stalled again the people at the shopit was the fuel filter so i go get that replaced.Now the car runs even worse,first it didn't start so i change the spark plugs got it started but runs like **** blowing out black smoke from the exhaust.it'll run for like 5 mins and starts spuddering into a stall.and reeks of gasoline does any1 know what it could be .