I've been battling it for a while with my 01, finally just did a full write with a 2k .bin and so far so good. The emulator either failed or didn't do its job, but it would still flash like it was working and gas mileage was crap.

You can also leave the rear 02 plugged in and hang it somewhere, as long as it gets a signal its working it should not throw a code or alter your gas mileage that way.