no wideband still right? if not definitly investing in one would be really benificial, as with the widebands this can help you determine things that are going wrong with the car, such as lean issues, or rich issues, and it will put you on the right path as far as hunting down your problems.
as far as the dying out, and hunting idle you can try to clean the maf and reground it and see if that doesnt fix some things. maf's are really finicky and when they get dirty or the grounds are 100% you can get a bunch of problems.