Hi, I need some advice on swapping an engine vq35de auto 2004. My new engine is JDM vq35de engine. Anything that i need to be careful or look out for when installing the new engine.
1 Do i need to use my old engine harness?
2 Do i need to use my old cpu?
3 Will there be a check engine light when i finish the installation?

Thank you guys!! Any advice is very welcome.