My car is cutting off at the stop light.

Check your charging system for weak alternator or battery.Also check brake light for short.

Change the Plugs, wires (incase of a short in plug wires or misfire) and install a new cap and rotor, try replacing the fuel filter on the firewall in front of the driver's side. then run a bottle a Sea foam through the fuel system to clean the system and the injectors. should clear up any idling problems