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Nissian told me there is not a fuel injector valve for my 2005 nissian altima 2.5s 4cylinder

If Nissan said there isn’t one, then generally there isn’t one. It could be that you might be referring to a cold start pump or cold start injector. Which has nothing to do with the fuel injection system. A cold start injection system, just pushes air in the combustion chamber after combustion to aid post combustion ‘burn’ and allow for lower emissions.