Catalytic Converter, Ignition, or Fuel System?

[Chris (from L.C.)]

I just bought a 1995 850 Turbo Sedan from a small dealer about 3 hours from where I live. Yesterday, it started missing and stumbling, with it getting increasingly worse throughtout the day. Just earlier, I drove about 2 miles from my house to someone else's, and it barely made it. It will start and run, but stumbles badly and has no power. I also noticed that just before I pulled in, there was a 'poof' of sparks/burning material (catalyst, I assume) out of the exhaust. When I got the vehicle stopped, the cat was glowing pretty significantly.

Also, when it started missing/stumbling yesterday, it triggered the CEL. The codes are:

1310 - Misfire from at least 1 cyl, TWC damage
0304 - Cyl 4 misfire
0300 - Random/Multiple Misfire.

I also noticed the typical sulphur/egg smell after I pulled in here, and There has been a gas smell throughout the day today and yesterday. I replaced the plugs already, the old ones were white when I pulled them. I checked the intake path, and cleaned it, and started the vehicle. I let it 'run' about 15 seconds or so, and then pulled a couple of the plugs. They were soaked in fuel. There also is the fuel smell coming from the tailpipe during while it was running today.

Any ideas? I just bought this car two days ago, and it's already giving me crap.

[Chris (from L.C.)]

*edit*
I also pulled the distributor cap, and checked the rotor/cap/contacts. They were nearly spotless.

[White850Turbo]

Check the connections on the plug wires to the plugs. The Bosch variant of the spark plug wires for these cars are infamous for breaking at this point causing misfires, etc.