Have you recently had the sparkplugs out or changed? It may be possible that some of the wires were mixed up, so check your firing order.
P0303 : misfire cylinder #3
P0420 Catalytic Converter is bad p1320 misfire P0305 - Cylinder 5 Five Misfire
Coil pack and the spark plug- check compression
Trouble code P0300 means: Random/multiple cylinder misfire detected
Your 2000 Nissan Maxima has a 3.0 liter V6 engine , so it has ( 6 ) engine cylinders It sounds like there is a problem with the # 5 engine cylinder , perhaps an engine cylinder misfire ?
Trouble code P0300 means:Random/multiple cylinder misfire detected
its a Nissan for starters but it could be the plug wires or the plugs or the distributor
You need to isolate the cause of the misfire. Could be plug, wire, fuel, injector, internal engine, etc...
Where is cylinder 2 nissan murano
Tune up
cylinder 4 misfire detected code p0304 will not pass emissions test want do I need?
You have a misfire on cylinder number 2. Start with replacing the spark plugs. That's a big job on those vehicles, so the spark plugs that are in there are probably the original ones.