With all those codes and symptoms, I'm going to say I'm 99% sure that you have bad connections at the ECM. The contacts in the plug and on the computer side are probably dirty, maybe corroded, and the contacts may have spread apart a little. Undo the negative battery cable, then the plug to the computer, and clean all the pins and receptacles on both sides of the connection. Repack with dielectric grease (auto parts stores and Radio Shack have this). Reconnect battery. If you are diligent in this, I can almost guarantee the problem will go away.
And change those 22-yr old wires. WOW. You can't tell from looking. They will be marginal. I'd change the cap and rotor, too.
There are no vacuum lines to any Chrysler transmission. They are all hydraulically and/or electrically controlled. If that line goes to a small canister on the brake booster, it is a vacuum check valve for the heater control function.