up? I replaced all my connector ends years ago and the '91 OEM harness works just fine. It's a trade off in the time needed to do the connectors vs. pulling the engine and doing the harness then. If an engine pull is coming up soon - might be a less time consuming approach?
FYI: My replacement connectors (injectors, IACV, etc) are a GM style and they seal the wiring/connectors much better than the Nissan (old) design.