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I bought a 2004NISSAN ALTIMA THAT WAS FIRING UP ON THE DIME NO PROBLEM BUT I SWAP IT INTO ANOTHER BODY WHICH IS A 2006 NISSAN ALTIMA BODY NOW IT IS CRANKING BUT WANT START BUT WHEN THEY POOR GAS OR STARTER FLUID IT CRANKS UP AND RUN FINE BUT AFTER TURNING IT OFF SAME THING TURNING OVER

Sounds like its not getting fuel. Make sure that the fuel injectors are working and the fuel pump. If the fuel pump isn’t working, your engine will never start.