how to fix my corsa sxi 1.2 1999?

i have a corsa sxi 1999 it will not start right, if i leave it over night then jump it with my brothers car it will start first try, how ever it will stall if it does below 2k revs but once it has stalled it will not start again. my battery is flat ive changed the fuel pump relay i have power at the fuel pump then cranking, it has had a new gasket and been skimmed too. the timing was 180 out but has need fixed now. any help would be great