Q: Engine check light, rough idle, loss of power.

My name is john. i own a '07 kia optima ex v6 in excellent condition,always dealer serviced in the 4+ years i've had it. But sporadically over the last year or so, the wife or i can be driving along on the hwy or in the city, then all of a sudden the check engine light will come on and the car will start loosing power,shudder and barely make it to the shoulder or curb. Once in park,it is still running rough at idle with no throttle response. If we turn the car off for a couple of minutes then restart it,its like it never happened although the check light will still be on and eventually go out by itself a few minutes down the road. The car has had a new timing belt at 115k, major tuneup, and a new purge valve. A friend suspected maybe a bad MAF Sensor since i at one time had a K&N air filter. I've since cleaned it twice and noticed a slight improvement. Could that be my issue?

My car has 135 miles.
My car has an automatic transmission.