Ok, just got back from school. Checked AllData and the P1171 code that I had that showed up as "Unknown Powertrain DTC (Manufacturer Controlled; Fuel and Air Metering)" on my cheapy scan tool (CarChip e/x) is "Fuel system lean during acceleration" according to AllData.

Also talked to one of my teachers and told him the short version of the problem and he thinks the wire harness stuff is BS.

So I think that the drivability problem (what I can notice) is a partially plugged catalytic converter because replacing one fixed the drivability problem last time. But I think something not so noticeable is causing the catalytic converter to plug up.

Is it possible that with a cracked intake manifold gasket the ecm would be trying to make things richer so I would always be running rich and all that extra fuel could burn up in the catalytic converter causing it to plug up? For a while now I also had a hole in my fuel pressure regulator vacuum line and I think a slightly leaky fuel pressure regulator. So could a cracked intake manifold gasket, a hole in the pressure regulator vacuum hose, and a leaky fuel pressure regulator all on a car driven by someone with a lead foot (if that affects any thing) cause the catalytic converter to burn up/plug up?