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this job is not for a newbie. so here we go with instructions. i believe you posted under 2003 nissan maxima section for replacing plugs. remove engine trim cover that covers manifold and valve cover. remove ign coils on frt valve cover and remove and install new plugs for rear bank plugs you would need to remove upper intake plenum. disconnect all necessary electrical connectors and vacuum lines. make sure you are aware where the vacuum hoses go for reinstallation. remove ign coils on rear bank valve cover. remove and install new plugs. reassemble all parts.
Doesn't have one it does have a mass airflow senser and it's in the air intake hose on top of the air filter box. If the hose to the throttle body leaks in any kind of way ( attached hoses off or leaking cracked hose your gat Map codes the the airflow senser isn't getting full flow and theirs a problem that needs corrected check everything before changing the senser though as it's expensive and the senser is'nt returnable if your wrong.
A range of problems starting with something as simple as a nasty injector.
Sounds like an injector problem. Many owners with vehicles which came with injectors DO NOT look after the proper maintenance of them My brother-in-laws 2001 had this problem which dissipated after he ran a 1/2 tank full of hi test and a couple of cans of injector cleaner. DON'T DO THE FOLLOWING; BUT...in Germany many garages (private garages) would add a liter (quart) of Diesel to the Regular petrol to run through the system - which I tried on a sluggish 1989 Porsche 911 Carera.
I also replaced the Digital Motor Electronics fuel injectors with a set of Lucas's...my Porsche did the same as your Nissan
A simple hook up to a computerized analyzer should get to the cause in 10.8 secs flat.
mostly check engine light on may have problem with emission problems possiblely o2 senser in your car. you car might have 3or 4 sensor which oem part made by denso. you might have to scanner to read the code. second problem is seems like air circulation problem which might be map sensor or vaccum air flow might cought in. make sure you check with honest mechanic around you it might be no big problem