[57 3100]

ok guys,
i just did a scan, and it says there are no codes.
i am using a hand held actron pocketscan i bought 6 months ago from autozone. in the past when the engine light would come on and stay on, i would get codes that were for evap, i think.....cant remember, but i erased them at that time.
here is all i get now with the scanner hooked up and key on:

0 codes
mil off
monitrs
o inc
7 ready
misfire
fuel
comp
catlyst
evap
02 sensr
02 htr

and i get the same results when the engine is started.
my instructions are kind of vague. what is mil off and mil on ?
i only get mil off, and cant make it say mil on.

so, i still wonder why my service engine soon light flashes the way it does when im on the highway ? and im reading no codes ?

thanks for the help guys.... any suggestions ? should i just keep driving it since it is running fine ?

leonard