02 Z28 won't idle/run
 

Car starts fine but dies if I take foot off the gas pedal, if I give it gas car stays running.
Amp gauge is reading normal or a little high due to high idle to keep it running.
It did this a few weeks ago and I charged battery and it seem to be working fine. This morning when I put it in gear car died, nothing electrical worked (door locks) etc., wouldn't start/turn over/no clicking/nothing.
Get home from work and it starts and runs as stated above.
Battery?

could be but highly unlikely, my car once acted funny due to battery going bad. i removed the battery for a while and reinstalled it and it seemed to solve the problem, try doing that.

EDIT: one more thing, try checking battery terminals and tight incase they are loose.