most of the time you will have an emissions related fault like a faulty egr valve or pcv valve or you maf maybe dirty or one of your vaccum hoses maybe kincked or accidentally disconnected by a goof mechanic
if no warning and it just shuts down but dash lights and radio light up check ignition switch
If your car just shuts down even on the highway it is most likely the cam position sensor, I needed to replace mine for the same thing
Infiniti QX was created in 1997.
Oil for 1997 infiniti needed
Where is the thermostaton a 1997 infiniti q45
If you lost power while driving it could be the alternator. Its not charging your batter anymore
Check the fuel pump.
could be bad fuel filter.
the egntion
Simple answer is the alternator
commandocaralarms.com
10w-30