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well, it may just need and injector cleaning service or top engine clean(seafoam). if you are fairly competent you can buy seafoam and do it yourself, but you can cause serious damage if it not done correctly.
also the coolant temp sensor may be defective but unless you have a dvom meter you will not be able to check it. if you do i can get the specifications for you. i think the cold start circuit is not on these newer maximas but you can check your fuses for a blown "start circuit" fuse.
i don't suspect the fuel filter as the culprit but's always a good idea to replace it every 30k or so to prevent such things like clogged injectors and a higher strain on the fuel pump.
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