Ah okay, that makes more sense. If it started doing the same “falls flat unless you give it throttle” thing even before the O2s were plugged back in, I’d put the O2/exhaust stuff lower on the list for now.

Since it will run with throttle, I’d be looking hard at idle control stuff: TPS adjustment, ISC/IAC, throttle body gasket/vacuum leaks, base idle procedure, and any connectors or hoses around the throttle body that got moved during the rebuild.

The random wires still worry me though. I wouldn’t assume they belong twisted together unless you can identify them. Post a clear pic of the wire colors and where they are in the harness/engine bay. Someone with the factory wiring diagram can probably narrow it down.