1996 Mercury Tracer gas in the oil

Hi, I just got this car it would barely run when I got it I thought maybe the timing belt had jumped but when I checked firing order I found out that none of the wires were on correctly I re done them but it still runs rough and the oil smells like gas could it be that it was misfiring and not burning the gas or is there another problem I'm going to buy a code scanner to read the CPU with and see if any thing needs replaced. Any help would by a great starting place.
Thanks Tim