Engine light comes on but it drives great

no car told at all just year. cuts off?? means what?. we can not see car or drive it.
the engine stalls, 0 RPM driving? automatic transmission?
or engine misfires. (shakes hard felt and heard)
or engine bogs (means lack of engine power)smooth loss?

or all electrics go dead for sure head lamps driving,
radio goes dead
heater blower goes dead.
modern cars can have 30+ fuses and 50 +loads
Imagine a tree? and learn those paths.
and we learn to see if car has electrical problems first.
no car told so I give up
ok fast right foot can not save the stall. a free test

or engine runs great just dash fails.
I cannot figure it out.

you can't fix what you can't find . wait till the light stays on , then take it to a shop

This happened to my 95 Royale while driving around town. I checked the battery terminals and one was slightly loose. After tightening it, no more dying.

May need new battery connectors and a good tune up

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.

When the Check Engine light (or Service Engine Soon or small picture of an engine) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

engine lights also report on the transmission problems
try having the fault codes read instead of fixing what probably ain't broke

there is a pressure sensor on the fuel tank, it is most likely bad and makes the system look like it has a leak to the computer that monitors the sensor, replace the evap system gas tank pressure sensor

Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.

You have a shorted circuit somewhere. Look at the plug wires for contact with ground.

the white smoke as it stalls could be steam in the exhaust. This is caused by coolant leaking into cylinders from a leaking head gasket. You should check cylinder compression next with a compression tester.