2009 Chevy Malibu ls 2.4l

So the car stopped running I put a starter on them
it would turn over but not start. Put ether in intake it
will start and run a few seconds.

Changed out fuel pump still will not start just turns
over

Mechanic said injectors have 65 psi or 65 lbs of
pressure or whatever that slang is.

What could be the issue I did see a post about theft
system and this car has been locking and
unlocking. By its self you will be going down the
road and locks will lock unlock or when it is turned
off in yard it will sit there and lock unlock back and
forth not sure if that has anything to do with it not
starting or not

What else could be there issue and how can I
resolve