give us more details on your set up....... we can't help you if you just say "my car runs rich, why? and how do i fix it"..... we're not with you, standing in front of your car with the hood popped... we need details, specs, mods, boosted? NA? KA or SR or RB?

is it even a Nissan or are you trying to get your Ford Pinto fixed by Nissan tech?

we don't know what you have, help us, help you...