yes, you reset your ecu everytime u unplug the battery.
anyhow, when you reset the ecu, it grabs all the info from the sensors so your car doesn't run too lean or rich but its not like an aftermarket ecu where you can adjust the parameters..
thanks everyone going to put some pics up when i figure out how too up load them from my phone i hate my droid i got an 1990 gs integra bad idle problems some times