Hi,
So...transmission is being replaced, throwing a lightened flywheel in.

Any chance an idle air relearn will adjust the engine idle level?
Or do I need Nissan to adjust the idle?

Anyone have a good link to the idle air relearn...How-To links are screwed up

 

idle shouldn't change because of the flywheel

 

Yeah, you don't need to worry about anything. It should start right up and idle fine.