why is my maxima missing and service light comes on

If it's a hard misfire you are probably doing damage to your catalytic converter. When it misses it dumps fuel into the exhaust which is bad for the CAT. I would not drive the car any longer. It will be cheaper to get a tow than to do damage to your engine and CAT. Use this link to find a good shop near you. https://repairpal.com/repair-shops Alex