Could be the coils wearing out, could be the drivers in the PCM wearing out, could be worn out plug wires, is your engine coil on plug or does it have a distributor still? You mention plug wires and then coils, not coil. If it's a distributor style it's one coil usually on the fender well, and then a cap and rotor on the front of the head, rotor bolted to the end of the camshaft. Those wear out. New cap and rotor, new wires and yes you NEED the oem style replacement wires that are like a hundie plus because of the connectors (sucks, but those are the breaks). Do the cap and rotor first, then recheck the wires (replace as necessary), if you're getting spark chances are the coil and PCM are fine. If it's been running rich (lack of spark) that could explain the fuel saturated crankcase, also replace the pcv valve if equipped. You may not be in to bad of shape here.