Hey guys so I have a 2004 Nissan Xterra with the vg33. Its currently having a misfire and it marks the codes p0303 and p0456. p0456 was there a few weeks before the misfire started. Weird thing is that it misfire sometimes when I start it after just driving it (like went to the store for a bit and came back in a few minutes). The misfire will happen for about a minute, then goes away. But misfire only happens sometimes. Just a quick note, it also has the code p0420 which is it needs a catalytic converter but it’s been there for over a year.