Taping up the harness won't help... Most likely since you have so many codes, I would venture a guess that either the engine harness or ETA is no good. Start by clearing them and see which ones come back.
In the meantime it wouldn't hurt to check the condition of the main engine harness and ETA. There should be a white delphi tag around/below the battery tray with a date code. If it was made prior to 1997 most likey the engine harness is no good. Also inspect the engine harness near sensors, where you can see the wire jacket insulation (if its brittle, cracked or missing).
For the ETA you have to cut a slit in the rubber pigtail (from the ETA). Look for the same things: brittle/cracked/missing insulation and corroded wires.
Engine harness is about $1000 and not difficult to install. The ETA can be DIY rewired or sent out to have the pigtail replaced for $200-$500 or reman $900 or new $1500.