Intermitant Stalling/starting issues

1999 Grand AM GT V6 Auto 47,000

Issues started after running out of gas. Will be fine for a week then start stalling while driving and/or wont start unless giving it a little gas (70% of the time), also seems to idle like it will stall and sometimes does. Replaced fuel pump and filter and a module (not sure which) and replaced gas tank. Had fuel system cleaned. The Service Engine Light has come on with a P0442 code (EVAP) (small leak detected) but my mechanic can't find a leak. May be fine for a couple days then act up again. Sometime when she stalls while driving I can shift to nutral and restart, other times I have to pull over and crank on it and most times it will start while giiving it a little gas (but may stall out when I let off the gas. Have gone through a starter and alternator during this time. I am going broke with this car. Please help!