It was diagnosed with a failed injector on # 1 cylinder
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1993 Infiniti J30 Question: What do I have to remove to install a fuel injector on # 1 cylinder?
Answer #1DaveJHM April 19, 2011, 17:06Master
The upper intake manifold comes off, the injectors and fuel rail come off as an assembly. Replace the injectors you need to replace; replace o-rings on all.
If you have not done this job before, have a pro give you guidance. You would not want to make a mistake here with the volatility of fuel components.