2010 chevrolet malibu cranks but no start

hi everyone, i have a 2010 chevy malibu that has starting problem. It cranks
but no start. It gets enough fuel(i checked fuel pressure). I replaced mass air
flow sensor, and throttle body, and still nothing. Main reason i changed the
mass sensor and throttle body was becuase i had that issue 2 years ago and
replacing those fixed it. I dont have security problem with the car either(no
code, and i programmed a new key to it as well and still nothing).im totally
lost, my mechanic cant figure it out either. he tried the ignition wires to make
sure they are fine and they were. any idea what i should do next? btw no
engine code or anything