Check Engine Light

I thought this problem was only accuring when my cas level was just hitting below half tank, but I just had between 3/4 to a full tank, and the light kicked on, and the car drove with a lot of hesitation. If you pull over right away, shut the car off for a count of 30 seconds, and start it right up, the car runs normal, but the light is still on. I take it to Autozone to get the codes red, and the light is off before I get there, or no codes will read, since it is driving better. This happens just about every 2 to 3 days now.

Easy steps first...

First check the gas cap to make sure is tight, also inspact the seal to make sure it's not broken or worn out.
If that doesn't help then take the car to AutoZone while the Check Engine Light is still on that way they can see what's trpping the system.
Without a code it's very dificult to diagnose what's wrong!