I once had a brand new 350Z .. it has a 3.5L VQ engine very closely related to this one..jlocal wrote: ↑Mon Jun 29, 2020 10:57 pmI'm not sure, he works on Nissan exclusively and said the intake is to small for this engine. The PCV valve is not sufficient for the engine size. Oil gets into the intake manifold and causes problems. My PF is running good now with all that was done, but if a rough idle is a normal thing, I'm ok with that. It just seems strange with no strain on an engine it would have a shake or stutter in such a way it does.