intermiten CEL???

when im driving the MIL will come on for a few miles and shut off. what could this be? or can someone tell me how to retreve codes from this car.

Any local Auto parts store can pull codes for free.

the codes that i pulled are code 8 and code 24. 8 is airflow sensor and 24 is closed loop. they are both intermitien. can any one point me in the rite direction? im new to this car so any help would be appreciated!! thanks!