92 ciera stalls

My 92 ciera stalls when i start it up in the morning right when i put it in reverse. I have to either gun it down my driveway to not stall, or put it back in drive and wait for the idle to go back up. I put some fuel injector cleaner in and its still in the tank, but hasn't done much as of yet. its only got 45000 miles so the engine is in good condition. any ideas on a easy fix?