Quote:
Originally Posted by Cyber370
... When codes pop up, you always start with investigating recent changes and mods.
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Excellent advice.
Quote:
Originally Posted by Zatanna Z
... I will replacing my cats with tomei test pipes soon anyways so maybe that’ll fix this issue! ...
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And don't make any more mods until you get this problem figured out. While it is possible that the cats are causing the problem, it is low on the list and there's a chance that changing, at this point, may make things worse.
Once again, a P0300 is a generic code that doesn't give any indication of the cause (a cylinder misfired for no apparent reason). You will have to track down the items that can cause the code and eliminate them one-by-one. The procedures Nissan uses are in the FSM (link in my sig).