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Q: Sequential injector failure on 1992 Nissan 300ZX

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Had good running car except at idle when only five cylinders fire. Replaced injector wiring harness on each injector, no change, replaced two additional injectors, third injector now failing. Car has 82K miles and ran on all six prior to touching injector wiring. Three injectors later, problem injector appears to be reappearing after plenum replaced, Help! Why cannot this be diagnosed properly? Corrosion on injector tabs not cleaned by technician which is difficult but better alternative than replacement.
(1) Answer
The wiring to each injector needs to be properly tested, and repairs made if necessary. Sometimes trying to "fix" a harness can make it worse, and the entire wiring harness may need to be replaced to resolve this.