Bought a 95 exteded cab truck with issues

[Ackattack]

So I bought a 1995 extended cab 2wd tonight that has some issues that I will need to get figured out. Its a 305 with a 5 speed. The fuel pump is new.

Apparently the truck was having some issues with not running real well and a periodic severe loss of power. The PO thought it was a clogged catylitic converter, and cut the front of the cat off, and said he heard loose clunking material in there. He got fed up with it, and sold it to me.

So currently the y-pipe is cut right between where it y's together and the cat. Its loud (of course) and would kind of run, almost die, then run OK, then not much power, and smells rich.

I don't have the truck home yet (picking it up on Wednesday), but I'm thinking that the oxygen sensor is currently showing lean since the y-pipe is cut, there for its over fueling and running rich.

Also, on the back of the engine (right next to where the hood lamp is, also next to the distributor), there is a flat 4 wire connector with nothing connected any ideas of what this would be to? Would this connect to the auto tranny if it had one? Didn't have a chance to really look to see if something was disconnected.

Any other suggestions on what to check or what it could be? I have a cable to read the ecm and codes. I also have a tbi fuel pressure guage, but will need to get the adapter to plug the fuel line into. I'll get the cat replaced and get the exhaust sealed up and see where I'm at. What could have caused a cat to get clogged besides 270,000 miles

Maybe all is fine, just old cat clogged up the exhaust and now the cut open exhaust is causing it to run way rich. Guess we'll find out.